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Yu Otake

Section

Graduate School of Engineering

Job title

Associate Professor

Degree

Doctor Engineering (Gifu University)

researchmap

https://researchmap.jp/y_ohtake

J-GLOBAL ID

201801004770081428

e-Rad No.

90598822

Research History 3

2020/04 - Present

Tohoku University　Department of Civil Environmental Engineering　Associate Professor
2017/04 - 2020/03

Niigata University　Faculty of Engineering Department of Engineering　Associate Professor
2014/08/01 - 2017/03/31

Niigata University　Faculty of Engineering Department of Civil Engineering and Architecture Civil Engineering　Associate Professor

Education 1

Tokyo Institute of Technology　Graduate School, Division of Integrated Science and Engineering　Interdisciplinary Graduate School of Science and Technology

1989/04/01 - 1991/03/31

Committee Memberships 28

公益社団法人土木学会　調査研究部門土木学会論文集編集委員会 C分冊編集小委員会幹事

2021/04 - Present
国土交通省北陸地方整備局　北陸河川堤防調査委員会委員（阿賀野川を担当）

2021/04 - Present
公益社団法人日本道路協会　深礎基礎便覧WG（斜面上の深礎基礎設計施工便覧改定WG）委員

2019 - Present
公益社団法人日本道路協会　鋼管矢板基礎便覧WG（鋼管矢板基礎設計施工便覧改定WG）委員

2019 - Present
応用力学委員会データ駆動型の信頼性設計とリスク評価実装研究小委員会　公益社団法人土木学会委員長

2019 - Present
地盤安定性及びリスク評価小委員会　公益社団法人土木学会原子力土木委員会委員

2018 - Present
ISO13824 Bases for design of structures – General principles on risk assessment of systems involving structures, ISO/TC98/SC2/WG11 Committee Member.

2017 - Present
国土交通省北陸地方整備局　総合評価審査委員会道路部会委員

2017 - Present
国土交通省北陸地方整備局　リバーカウンセラー（阿賀野川）

2016 - Present
公益社団法人技術士会北陸支部　建設関連産業若手技術者マンパワーアップ小委員会委員長

2016 - Present
公益社団法人日本道路協会　下部構造小委員会部分係数設計法WG（道路橋示方書改定WG）委員

2016 - Present
応用力学委員会土木分野における数値解析におけるV&Vに関する小委員会　委員

2016 - Present
International Society for Soil Mechanics and Geotechnical Engineering（ISSMGE）TC304　Committee Member

2015 - Present
地盤工学会　堤防研究小委員会委員

2013 - Present
公益社団法人地盤工学会　地盤工学会誌編集委員会委員

2015 - 2019
「地盤工学・実務シリーズ河川構造物の調査・設計から施工まで」執筆編集委員会委員

2013 - 2019
公益社団法人土木学会　応用力学委員会逆問題小委員会幹事

2012 - 2019
公益社団法人地盤工学会　地盤工学会調査研究部幹事長

2016 - 2018
公益社団法人土木学会構造工学委員会　設計基準体系における安全性照査ガイドライン研究小委員会委員

2014 - 2018
公益社団法人土木学会　土木学会論文集編集委員

2016 - 2017
構造工学委員会　構造物ヘルスモニタリングにおける意思決定手法研究小委員会幹事

2015 - 2017
構造工学委員会　既設構造物の安全性評価小委員会幹事長

2015 - 2017
原子力土木委員会　地盤安定性評価小委員会委員

2013 - 2015
構造工学委員会　橋梁の維持管理システム研究小委員会委員

2013 - 2015
IALCCE2014 Fourth International Symposium on Life-Cycle Civil Engineering　Committee Member

2013 - 2015
構造工学委員会　構造物安全性連絡小委員会委員

2012 - 2014
独立行政法人原子力安全基盤機構　斜面安定性検討分科会WG 委員

2012 - 2014
国土交通省国土技術政策総合研究所　コンテナターミナルの高潮浸水リスク評価に係る勉強会委員

2019 -

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Professional Memberships 3

日本計算工学会

2020/04 - Present
THE JAPANESE GEOTECHNICAL SOCIETY
JAPAN SOCIETY OF CIVIL ENGINEERS

Research Areas 1

Social infrastructure (civil Engineering, architecture, disaster prevention) / Geotechnical engineering /

Awards 9

事業企画賞

2021/05　地盤工学会　実務シリーズ33.河川堤防の調査・検討から維持管理まで
論文賞

2021/03　日本計算工学会　数値解析結果の空間モード分解による津波のリスク評価
関西支部論文賞

2017/04　公益社団法人地盤工学会　道路盛土における「宙水」の発生メカニズムと発生条件の解明
新道路技術会議（国土交通省道路局）優秀技術研究開発賞

2016/12　国土交通省　道路橋示方書の改定を踏まえた性能設計概念に基づく設計照査手法についての研究開発―特に下部構造物を中心として
論文賞（和文部門）

2015/06　公益社団法人地盤工学会　震災履歴を有する河川堤防20kmにおける地盤調査地点を考慮した液状化危険度解析とその有効性検証
論文賞(和文部門)

2015/06　公益社団法人地盤工学会　調査地点を考慮した長大水路の液状化危険度解析
論文賞

2014/06　公益社団法人土木学会　地盤パラメータ局所平均の空間的ばらつきと統計的推定誤差の簡易評価理論
第67回土木学会年次学術講演会優秀講演者賞

2012/09　公益社団法人土木学会　地盤構造物の信頼性解析法の開発その1：直接基礎
第47回地盤工学研究発表会優秀講演者賞

2012/09　公益社団法人地盤工学会　地盤パラメータ局所平均を用いた空間的ばらつきの簡易信頼性評価法の検証

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Papers 140

A fundamental study on introducing time-delay embedding to enhance the applicability of dynamic mode decomposition for seismic response analysis

Akihiro Shioi, Yu Otake

Soil Dynamics and Earthquake Engineering　200　109806-109806　2026/01
Publisher: Elsevier BV
DOI： 10.1016/j.soildyn.2025.109806 　

ISSN： 0267-7261
Exploring high-order multivariate geotechnical features using the minimum information dependence model

Taiga Saito, Yu Otake, Stephen Wu, Keisuke Yano

Geodata and AI　2　100009-100009　2025/03
Publisher: Elsevier BV
DOI： 10.1016/j.geoai.2025.100009 　

ISSN： 3050-483X
Sensitivity Analysis on Critical Combinations of Input Parameters in DEM Granular Flow Analysis

Junsen Xiao, Kenta Tozato, Reika Nomura, Yu Otake, Kenjiro Terada, Shuji Moriguchi

TC 105 INTERNATIONAL SYMPOSIUM　1480　2025

DOI： 10.1088/1755-1315/1480/1/012102 　

ISSN： 1755-1307
Scenario Superposition Method for Real‐Time Tsunami Prediction Using a Bayesian Approach

Saneiki Fujita, Reika Nomura, Shuji Moriguchi, Yu Otake, Randall J. LeVeque, Kenjiro Terada

Journal of Geophysical Research: Oceans　129　(12)　2024/12
Publisher: American Geophysical Union (AGU)
DOI： 10.1029/2024jc021565 　

ISSN： 2169-9275

eISSN： 2169-9291

More details Close

Abstract In this study, we propose a scenario superposition method for real‐time tsunami wave prediction. In the offline phase, prior to actual tsunami occurrence, hypothetical tsunami scenarios are created, and their wave data are decomposed into spatial modes and scenario‐specific coefficients by the singular value decomposition. Then, once an actual tsunami event is observed, the proposed method executes an online phase, which is a novel contribution of this study. Specifically, the predicted waveform is represented by a linear combination of training scenarios consisting of precomputed tsunami simulation results. To make such a prediction, a set of weight parameters that allow for appropriate scenario superposition is identified by the Bayesian update process. At the same time, the probability distribution of the weight parameters is obtained as reference information regarding the reliability of the prediction. Then, the waveforms are predicted by superposition with the estimated weight parameters multiplied by the waveforms of the corresponding scenarios. To validate the performance and benefits of the proposed method, a series of synthetic experiments are performed for the Shikoku coastal region of Japan with the subduction zone of the Nankai Trough. All tsunami data are derived from numerical simulations and divided into a training data set used as scenario superposition components and a test data set for an unknown real event. The predicted waveforms at the synthetic gauges closest to the Shikoku Islands are compared to those obtained using our previous prediction method incorporating sequential Bayesian updating.
Future-proofing geotechnics workflows: accelerating problem-solving with large language models

Stephen Wu, Yu Otake, Daijiro Mizutani, Chang Liu, Kotaro Asano, Nana Sato, Taiga Saito, Hidetoshi Baba, Yusuke Fukunaga, Yosuke Higo, Akiyoshi Kamura, Shinnosuke Kodama, Masataka Metoki, Tomoka Nakamura, Yuto Nakazato, Akihiro Shioi, Masahiro Takenobu, Keigo Tsukioka, Ryo Yoshikawa

Georisk: Assessment and Management of Risk for Engineered Systems and Geohazards　1-18　2024/07/25
Publisher: Informa UK Limited
DOI： 10.1080/17499518.2024.2381026 　

ISSN： 1749-9518

eISSN： 1749-9526
Pathway to a fully data-driven geotechnics: Lessons from materials informatics

Stephen Wu, Yu Otake, Yosuke Higo, Ikumasa Yoshida

Soils and Foundations　64　(3)　101471-101471　2024/06
Publisher: Elsevier BV
DOI： 10.1016/j.sandf.2024.101471 　

ISSN： 0038-0806
Optimization of a Tsunami Gauge Configuration for Pseudo-Super-Resolution of Wave Height Distribution

Saneiki Fujita, Reika Nomura, Shuji Moriguchi, Yu Otake, Shunichi Koshimura, Randall J. LeVeque, Kenjiro Terada

Earth and Space Science　11　(2)　2024/02

DOI： 10.1029/2023EA003144 　

eISSN： 2333-5084
Sensitivity analysis on critical combinations of input parameters in DEM granular flow analysis

Junsen Xiao, Kenta Tozato, Reika Nomura, Yu Otake, Kenjiro Terada, Shuji Moriguchi

Acta Geotechnica　2024

DOI： 10.1007/s11440-024-02499-2 　

ISSN： 1861-1125

eISSN： 1861-1133
DATA-DRIVEN SEISMIC RESPONSE ANALYSIS BASED ON DYNAMIC MODE DECOMPOSITION WITH TIME-DELAY EMBEDDING

Akihiro SHIOI, Yu OTAKE, Ikumasa YOSHIDA, Shogo MURAMATSU

Japanese Journal of JSCE　80　(15)　n/a-n/a　2024
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/jscejj.23-15006 　

eISSN： 2436-6021
RELIABILITY ASSESSMENT OF MULTIVARIATE SOIL PROPERTIES UNDER OFFSHORE AIRPORT USING LARGE-SCALE GENERIC DATABASE AND HIERARCHICAL BAYESIAN MODEL

Taiga SAITO, Yu OTAKE, Stephen WU, Daiki TAKANO, Yuri SUGIYAMA, Ikumasa YOSHIDA

Japanese Journal of JSCE　80　(15)　n/a-n/a　2024
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/jscejj.23-15009 　

eISSN： 2436-6021
What Defines a “Site” in Geotechnical Engineering?: A Comparative Study between Local and Global Big Indirect Databases

Taiga Saito, Yu Otake, Stephen Wu, Daiki Takano, Yuri Sugiyama, Ikumasa Yoshida

2024
Publisher: Elsevier BV
DOI： 10.2139/ssrn.4858448 　
A METHOD FOR EVALUATING MATERIAL UNCERTAINTIES IN OVERTOPPING EROSION ANALYSIS OF RIVER LEVEES

Shinnosuke KODAMA, Daichi HIRANO, Shinichiro ONDA, Yu OTAKE, Yosuke HIGO

Japanese Journal of JSCE　80　(16)　n/a-n/a　2024
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/jscejj.23-16155 　

eISSN： 2436-6021
Quantification of the contribution ratio of relevant input parameters on DEM-based granular flow simulations

Junsen Xiao, Kenta Tozato, Shuji Moriguchi, Yu Otake, Kenjiro Terada

Soils and Foundations　63　(6)　2023/12

DOI： 10.1016/j.sandf.2023.101378 　

ISSN： 0038-0806
Estimation of engineering bedrock layer utilizing ground surface elevation in Gaussian process regression

Yuto Tsuda, Yukihisa Tomizawa, Ikumasa Yoshida, Masao Wada, Naoaki Suemasa, Yu Otake

Computers and Geotechnics　160　2023/08

DOI： 10.1016/j.compgeo.2023.105548 　

ISSN： 0266-352X

eISSN： 1873-7633
Multi-Resolution Convolutional Dictionary Learning For Riverbed Dynamics Modeling Peer-reviewed

E.Kobayashi, H.Yasuda, K.Hayasaka, Y.Otake, S.Ono, S.Muramatsu

2023/05

DOI： 10.1109/ICASSP49357.2023.10096452 　
ESTIMATION OF CROSS-SECTIONAL CHARACTERISTICS BY MACHINE LEARNING FOR EVALUATION OF ADDITIONAL STRESS DUE TO SHEAR LAG Peer-reviewed

Hiroki AOKI, Isao SAIKI, Yu OTAKE, Ryohei MITSUI

Japanese Journal of JSCE　79　(15)　n/a-n/a　2023/03
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/jscejj.22-15009 　

eISSN： 2436-6021
RELIABILITY ASSESSMENT FOR BEARING CAPACITY OF SHALLOW FOUNDATION AFTER SCOURING UNDER LIVE LOAD BY BAYESIAN INFERENCE Peer-reviewed

Yuna SASAKI, Hidetoshi NISHIOKA, Kohei KASAHARA, Taisuke SANAGAWA, Yu OTAKE

Japanese Journal of JSCE　79　(15)　n/a-n/a　2023
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/jscejj.22-15016 　

eISSN： 2436-6021
3D SPATIAL DISTRIBUTION ESTIMATION OF GEOTECHNICAL PROPERTIES CONSIDERING NONSTATIONARY IN THE DEPTH DIRECTION AND IMPROVEMENT OF CALCULATION EFFICIENCY BY KRONECKER PRODUCT Peer-reviewed

Yukihisa TOMIZAWA, Yuto TSUDA, Ikumasa YOSHIDA, Yu OTAKE

Japanese Journal of JSCE　79　(15)　n/a-n/a　2023
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/jscejj.22-15056 　

eISSN： 2436-6021
Estimation of Spatial Distribution Considering Indirect Data Using Gaussian Process Regression

Yuto Tsuda, Yukihisa Tomizawa, Ikumasa Yoshida, Yu Otake

Geotechnical Special Publication　2023-July　(GSP 345)　94-101　2023

DOI： 10.1061/9780784484975.011 　

ISSN： 0895-0563
REAL-TIME RECONSTRUCTION SIMULATION BASED ON AUTONOMOUS BASIS FUNCTION SELECTION

Yu OTAKE, Taiga SHOJI, Yosuke HIGO, Ikumasa YOSHIDA

Japanese Journal of JSCE　79　(15)　n/a-n/a　2023
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/jscejj.22-15013 　

eISSN： 2436-6021
Data-driven approximation of geotechnical dynamics to an equivalent single-degree-of-freedom vibration system based on dynamic mode decomposition

Akihiro Shioi, Yu Otake, Ikumasa Yoshida, Shogo Muramatsu, Susumu Ohno

Georisk　2023

DOI： 10.1080/17499518.2023.2184479 　

ISSN： 1749-9518

eISSN： 1749-9526
Sequential Bayesian Update to Detect the Most Likely Tsunami Scenario Using Observational Wave Sequences Peer-reviewed

Reika Nomura, Saneiki Fujita, Joseph M. Galbreath, Yu Otake, Shuji Moriguchi, Shunichi Koshimura, Randall J. LeVeque, Kenjiro Terada

Journal of Geophysical Research: Oceans　127　(10)　2022/10/05
Publisher: American Geophysical Union (AGU)
DOI： 10.1029/2021jc018324 　

ISSN： 2169-9275

eISSN： 2169-9291
Optimal probabilistic placement of facilities using a surrogate model for 3D tsunami simulations

Kenta Tozato, Shuji Moriguchi, Shinsuke Takase, Yu Otake, Michael R. Motley, Anawat Suppasri, Kenjiro Terada

2022/08/01
Publisher: Copernicus GmbH
DOI： 10.5194/nhess-2022-208 　

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Abstract. Tsunamis are associated with numerous uncertainties. Therefore, there has been an emphasis on setting the placement of infrastructure facilities based on probabilistic approaches. However, advanced numerical simulations have been often insufficiently utilized due to high computational costs. Therefore, in this study, we developed a framework that could efficiently utilize the information obtained from advanced numerical simulations for probabilistic assessment and investigation of the optimal placement of facilities based on calculated probability. Proper orthogonal decomposition (POD) techniques were employed for utilizing the data from the numerical simulations for probabilistic risk evaluation. We constructed a surrogate model in which POD was efficiently used to extract the spatial modes. The results of the numerical simulation were expressed as a linear combination of the modes, and the POD coefficients were expressed as a function of the uncertainty parameters to represent a result of an arbitrary scenario at a low computational cost. We conducted numerical simulations of the 2011 tsunami off the Pacific Coast caused by Tohoku Earthquake as an example of the method proposed in this study. The tsunami reached the target area, and the fault parameters of “slip” and “rake” were selected as the target uncertainties. We then created several scenarios in which these parameters were changed and conducted further numerical simulations using POD to construct a surrogate model. We selected the maximum inundation depth in the target area and the maximum impact force that acts on the buildings as the target risk indices, and we constructed a surrogate model of the spatial distributions of each indicator. Furthermore, we conducted Monte Carlo simulations using the constructed surrogate model and the information on fluctuations in uncertainties to calculate the spatial distribution of the failure criterion exceedance probabilities. We then used the Monte Carlo simulation results and a genetic algorithm to identify the optimal placement of facilities based on probability. We also discuss how the optimal placement changes according to differences in risk indices and the differences between parallel and series systems. The failure scenarios for each system are also discussed based on the failure probability. We show that the proposed method of efficiently utilizing advanced numerical simulation information was useful for conducting probabilistic hazard assessments and investigating the optimal placement of facilities based on probability theory.
Flow-Path Fitting From Images With Fourier Basis For River Health Assessment Peer-reviewed

Yuki TAKAHASHI, Shogo MURAMATSU, Hiroyasu YASUDA, Kiyoshi HAYASAKA, Yu OTAKE

2022/07

DOI： 10.1109/ICIP46576.2022.9897196 　
Challenges in geotechnical design revealed by reliability assessment: Review and future perspectives Peer-reviewed

Yu Otake, Yusuke Honjo

Soils and Foundations　62　(3)　101129-101129　2022/06
Publisher: Elsevier BV
DOI： 10.1016/j.sandf.2022.101129 　

ISSN： 0038-0806
Real-time tsunami risk evaluation method by synthetic dynamics and Bayesian update Peer-reviewed

NOMURA Reika, FUJITA Saneiki, OTAKE Yu, MORIGUCHI Shuji, KOSHIMURA Shunichi, TERADA Kenjiro, HASHIZUME Masahiro

Transactions of the Japan Society for Computational Engineering and Science　2022　(2022)　20220003-20220003　2022/05
Publisher: JAPAN SOCIETY FOR COMPUTATIONAL ENGINEERING AND SCIENCE
DOI： 10.11421/jsces.2022.20220003 　

eISSN： 1347-8826

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This study presents a method of real-time tsunami risk evaluation by combined use of proper orthogonal decomposition (POD) and Bayesian update. The validity of the proposed method is demonstrated through the numerical example targeting plausible tsunamis induced by Nankai-Trough events. First, tsunami simulations are carried out for plausible tsunami scenarios determined by various patterns of fault rupture, and the time histories of wave heights are stored at selected synthetic gauge points. Then, POD is applied to the resulting data matrix of the synthetic dynamics (SD) composed of dynamics modes and coefficients, the latter of which represent scenario-specific information. In the real-time risk evaluation phase, the wave sequences of an actual tsunami event are sequentially measured at the synthetic gauge points and used to estimate the corresponding dynamics coefficients of the constructed SD. At the same time, by the application of Bayesian update, the likelihood of each of the dynamics coefficients pre-calculated for the selected tsunami scenarios is evaluated at each time and sequentially updated to detect the most probable scenario. Finally, the pre-calculated tsunami arrival time and inundation depth distribution corresponding to the detected scenario are determined as risk assessment indices seven minutes after the tsunami generation.
Rapid tsunami force prediction by mode-decomposition-based surrogate modeling Peer-reviewed

Kenta Tozato, Shinsuke Takase, Shuji Moriguchi, Kenjiro Terada, Yu Otake, Yo Fukutani, Kazuya Nojima, Masaaki Sakuraba, Hiromu Yokosu

Natural Hazards and Earth System Sciences　22　(4)　1267-1285　2022/04/11

DOI： 10.5194/nhess-22-1267-2022 　

ISSN： 1561-8633

eISSN： 1684-9981
Practical dynamic reliability analysis with spatiotemporal features in geotechnical engineering Peer-reviewed

Yu Otake, Kyohei Shigeno, Yosuke Higo, Shogo Muramatsu

Georisk: Assessment and Management of Risk for Engineered Systems and Geohazards　1-16　2021/08/29
Publisher: Informa UK Limited
DOI： 10.1080/17499518.2021.1971250 　

ISSN： 1749-9518

eISSN： 1749-9526
River Flow Path Control With Reinforcement Learning Peer-reviewed

Dongqi Liu, Yutaka Naito, Chen Zhang, Shogo Muramatsu, Hiroyasu Yasuda, Kiyoshi Hayasaka, Yu Otake

2021 IEEE International Conference on Autonomous Systems (ICAS)　2021/08/11
Publisher: IEEE
DOI： 10.1109/icas49788.2021.9551113 　
Estimation of trend and random components of conditional random field using Gaussian process regression Peer-reviewed

Ikumasa Yoshida, Yukihisa Tomizawa, Yu Otake

Computers and Geotechnics　136　104179-104179　2021/08
Publisher: Elsevier BV
DOI： 10.1016/j.compgeo.2021.104179 　

ISSN： 0266-352X

eISSN： 1873-7633
Time‐Dependent Probabilistic Tsunami Inundation Assessment Using Mode Decomposition to Assess Uncertainty for an Earthquake Scenario Peer-reviewed

Yo Fukutani, Shuji Moriguchi, Kenjiro Terada, Yu Otake

Journal of Geophysical Research: Oceans　126　(7)　2021/07
Publisher: American Geophysical Union (AGU)
DOI： 10.1029/2021jc017250 　

ISSN： 2169-9275

eISSN： 2169-9291
Liquid bridge contribution to shear behavior of unsaturated soil: modeling and application to a micromechanics model Peer-reviewed

Yo Fukushima, Yosuke Higo, Takashi Matsushima, Yu Otake

Acta Geotechnica　2021/06/28
Publisher: Springer Science and Business Media LLC
DOI： 10.1007/s11440-021-01263-0 　

ISSN： 1861-1125

eISSN： 1861-1133
Sparse-Coded Dynamic Mode Decomposition on Graph for Prediction of River Water Level Distribution Peer-reviewed

Yusuke ARAI, Shogo MURAMATSU, Hiroyasu YASUDA, Kiyoshi HAYASAKA, Yu OTAKE

ICASSP 2021 - 2021 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)　3225-3229　2021/06/06
Publisher: IEEE
DOI： 10.1109/icassp39728.2021.9414533 　
Improvement of side resistance prediction for pile foundation using construction information Peer-reviewed

Yu Otake, Shinya Watanabe, Taisaku Mizutani

Canadian Geotechnical Journal　58　(4)　496-513　2021/04
Publisher: Canadian Science Publishing
DOI： 10.1139/cgj-2018-0835 　

ISSN： 0008-3674

eISSN： 1208-6010

More details Close

Problems such as the inclination and settlement of buildings after construction completion have been reported in recent years. Quality control during construction and mieruka (“visualizing” the work quality) are increasingly demanded. In light of this, the present study addresses execution with a “rotary penetration steel pipe pile (RPS-pile),” which is a system that is able to collect information in real time during the piling process. When an RPS-pile is placed, high push-in and pull-out bearing capacities are expected because the spiral blade at the pile tip resists at the bottom of the borehole against an external force. Additionally, continuous real-time data on the pile-head torque and the auger penetration depth per revolution are obtained, as these mechanical indicators are necessary for piling. This study aims at developing a method for the real-time confirmation of work quality at construction sites by utilizing construction information (information obtained during piling). Specifically, a method is proposed for the sequential updating of reliability in the estimation of the side friction acting on a drilled pile. In this method, real-time information on the pile-head torque and the auger penetration depth per revolution obtained during piling are used in addition to N-values that are observed in a standard penetration test conducted in advance as part of subsurface exploration.
特異値分解による線形次元削減と代替モデルに基づく耐震性能照査手法の高度化に向けた基礎的研究（その２）～重力式岸壁に対する地震応答解析への適用～ Peer-reviewed

住岡直樹, 宮田正史, 福永勇介, 大竹雄

国土技術政策総合研究所資料　1156　2021/03
ガウス過程回帰を用いた複数の地盤物性値間の相関を考慮した空間分布推定 Peer-reviewed

富澤幸久, 吉田郁政, 大竹雄

AI・データサイエンス論文集　2　(J2)　617-625　2021

DOI： 10.11532/jsceiii.2.J2_617 　
AUTOCORRELATION FUNCTION FOR SPATIAL DISTRIBUTION ESTIMATION OF GEOTECHNICAL PROPERTIES USING GAUSSIAN PROCESS REGRESSION Peer-reviewed

Yukihisa TOMIZAWA, Ikumasa YOSHIDA, Yu OTAKE

Journal of Japan Society of Civil Engineers, Ser. A2 (Applied Mechanics (AM))　77　(2)　I_485-I_494　2021
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/jscejam.77.2_i_485 　

eISSN： 2185-4661
Reliability Evaluation of Shallow Foundations Damaged by Scouring Based on Survival Analysis

西岡英俊, 大竹雄

地盤工学会誌(Web)　69　(7)　35-38　2021

ISSN： 2435-5348
地盤と地震応答解析の情報を最大限活用した耐震強化岸壁を対象とした新しい耐震性能照査体系に向けて

宮田正史, 福永勇介, 大竹雄, 住岡直樹

地盤工学会誌　69　(7)　27-30　2021
施工時や供用時の逐次信頼性更新に基づく新しい地盤構造物設計

大竹雄

地盤工学会誌　69　(7)　9-12　2021
Probabilistic tsunami hazard assessment with simulation-based response surfaces Peer-reviewed

T. Kotani, K. Tozato, S. Takase, S. Moriguchi, K. Terada, Y. Fukutani, Y. Otake, K. Nojima, M. Sakuraba, Y. Choe

Coastal Engineering　160　103719-103719　2020/09
Publisher: Elsevier BV
DOI： 10.1016/j.coastaleng.2020.103719 　

ISSN： 0378-3839
特異値分解による線形次元削減と代替モデルに基づく耐震性能照査手法の高度化に向けた基礎的研究～重力式岸壁に対する地震応答解析への適用～ Peer-reviewed

住岡直樹, 宮田正史, 福永勇介, 大竹雄

国土技術政策総合研究所資料　1100　2020/03
VISUALIZATION OF MICRO MORPHOLOGY FOR SOIL MICROMECHANICS MODELING : AN APPLICATION OF SUPER-RESOLUTION TO X-RAY CT IMAGES Peer-reviewed

Naoki ENDO, Yu OTAKE, Yosuke HIGO, Shogo MURAMATSU

Journal of Japan Society of Civil Engineers, Ser. A2 (Applied Mechanics (AM))　76　(2)　I_35-I_44　2020/02
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/jscejam.76.2_i_35 　

ISSN： 2185-4661

eISSN： 2185-4661
QUANTIFICATION OF PARAMETER CONTRUBUTION IN GRANULAR FLOW SIMULATIONS USING THE DISCRETE ELEMENT METHOD Peer-reviewed

Shuji MORIGUCHI, Hiroki OKUYAMA, Kenjiro TERADA, Yu OTAKE, Takayuki AOKI

Journal of Japan Society of Civil Engineers, Ser. A2 (Applied Mechanics (AM))　76　(2)　I_369-I_377　2020/02
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/jscejam.76.2_i_369 　

eISSN： 2185-4661
BASIC STUDY ON OPTIMIZATION OF SENSOR PLACEMENTS FOR REAL TIME ALTERNATIVE SIMULATION Peer-reviewed

Taiga SHOJI, Yu OTAKE, Kyohei SHIGENO, Yosuke HIGO, Shogo MURAMATSU

Journal of Japan Society of Civil Engineers, Ser. A2 (Applied Mechanics (AM))　76　(2)　I_25-I_33　2020/02
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/jscejam.76.2_i_25 　

ISSN： 2185-4661

eISSN： 2185-4661
信頼性設計に基づく橋梁基礎設計の多様化へ向けて

大竹雄

橋梁と基礎2020 7月号　2020
Tsunami risk assessment using spatial modes extracted from results of numerical analysis Peer-reviewed

Kenta Tozato, Takuma Kotani, Ryo Hatano, Shinsuke Takase, Shuji Moriguchi, Kenjiro Terada, Yu Otake

Transactions of the Japan Society for Computational Engineering and Science　2020　20200003　2020

DOI： 10.11421/jsces.2020.20200003 　

eISSN： 1347-8826
DATA DRIVEN DYNAMIC RELIABILITY ANALYSIS BASED ON SPATIOTEMPORAL FEATURE EXTRACTION WITH MODE DECOMPOSITION: APPLICATION FOR EFFECTIVE STRESS DYNAMIC ANALYSIS Peer-reviewed

OTAKE Yu, SHIGENO Kyohei, WATANABE Shinya, HIGO Yosuke, MURAMATSU Shogo

Journal of Japan Society of Civil Engineers, Ser. C (Geosphere Engineering)　76　(2)　142-157　2020
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/jscejge.76.2_142 　

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<p> Recently, the need for the robust design and the resilience design methods under accidental loading of soil structures has been the subject of many discussions. Herein, we are developing a dynamic reliability analysis base on mode decomposition for evaluating the failure mode of the soil structure. This analysis features quantifying uncertainties related to the accuracy of the parameter settings. This paper describes the deformation calculation procedure for the case of a simple embankment on a liquefiable sand layer. We conducted a dynamic eﬀective stress analysis to evaluate the liquefaction phenomenon in the sand layer. This study aimed to derive an alternative numerical analysis model that considers the space and time required for calculating the aforementioned deformed embankment.</p>
Tsunami hazard and risk assessment for multiple buildings by considering the spatial correlation of wave height using copulas Peer-reviewed

Yo Fukutani, Shuji Moriguchi, Kenjiro Terada, Takuma Kotani, Yu Otake, Toshikazu Kitano

Natural Hazards and Earth System Sciences　19　(11)　2619-2634　2019/11/22
Publisher: Copernicus GmbH
DOI： 10.5194/nhess-19-2619-2019 　

ISSN： 1561-8633

eISSN： 1684-9981
Improvement in the information-oriented construction of temporary soil-retaining walls using sparse modeling Peer-reviewed

Yu Otake, Shinnosuke Kodama, Shinya Watanabe

Underground Space　4　(3)　210-224　2019/09
Publisher: Elsevier BV
DOI： 10.1016/j.undsp.2018.12.004 　

ISSN： 2467-9674
A basic study on the application of LRFD in “the technical standard for port and harbour facilities in Japan”: a case of gravity type quay wall in a persistent design situation Peer-reviewed

Masahiro Takenobu, Masafumi Miyata, Yu Otake, Takehiko Sato

Georisk: Assessment and Management of Risk for Engineered Systems and Geohazards　13　(3)　195-204　2019/07/03
Publisher: Informa UK Limited
DOI： 10.1080/17499518.2019.1612525 　

ISSN： 1749-9518

eISSN： 1749-9526
Validation of Numerical Analysis Based on Mode Decomposition Peer-reviewed

Yu Otake, Yosuke Higo, Kyohei Shigeno, Shinya Watanabe

Proceedings of the 7th International Symposium on Geotechnical Safety and Risk (ISGSR2019)　679-684　2019
Modeling of Spatial Distribution of the Piping Hazard for River Dikes Based on Actual Data Peer-reviewed

Hiroto Koide, Yu Otake

Proceedings of the 7th International Symposium on Geotechnical Safety and Risk (ISGSR2019)　285-290　2019
A Basic Study on Reliability Analysis Method for Circular Slip Failure Considered with the Determination Method of the Characteristic Value of Soil Property in Technical Standard for Port in Japan Peer-reviewed

Masahiro Takenobu, Masafumi Miyata, Hideki Kawamata, Hiroaki Matsubara, Yoichi Watabe, Yu Otake

Proceedings of the 7th International Symposium on Geotechnical Safety and Risk (ISGSR2019)　152-157　2019
Normative statistical solutions for common geotechnical problems Peer-reviewed

Yusuke Honjo, Yu Otake

Proceedings of the 7th International Symposium on Geotechnical Safety and Risk (ISGSR2019)　120-125　2019
CONVOKUTIONAL-SPARSE-CODED DYNAMIC MODE DECOMPOSITION AND ITS APPLICATION TO RIVER STATE ESTIMATION Peer-reviewed

Y. Kaneko, S. Muramatsu, H. Yasuda, K. Hayasaka, Y. Otake, S. Ono, M. Yukawa

Proceedings of IEEE International Conference on Acoustics, Speech and Signal Processing, Signal Processing (ICASSP)　1875-1876　2019
Publisher: IEEE
DOI： 10.1109/ICASSP.2019.8683848 　
CHARACTERIZATION OF THE DETERIORATION FACTORS OF HARBOR PIERS BASED ON STATISTICAL ANALYSIS Peer-reviewed

Syusaku KITAZAWA, Yu OTAKE, Takeshi HYODO, Hideki HAYASHIDA, Yusuke HONJO

Journal of Japan Society of Civil Engineers, Ser. A1 (Structural Engineering & Earthquake Engineering (SE/EE))　75　(3)　311-319　2019
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/jscejseee.75.311 　

eISSN： 2185-4653
Optimal Sampling Placement in a Gaussian Random Field Based on Value of Information Peer-reviewed

Ikumasa Yoshida, Yosuke Tasaki, Yu Otake, Stephen Wu

ASCE-ASME Journal of Risk and Uncertainty in Engineering Systems, Part A: Civil Engineering　4　(3)　04018018-04018018　2018/09

DOI： 10.1061/ajrua6.0000970 　

ISSN： 2376-7642

eISSN： 2376-7642
サンプリングの極意：2. サンプリング計画

大竹雄

地盤工学会誌　66　(4)　50-57　2018
A Tsunami Risk Analysis Considering Correlations Among Coastal Cities Peer-reviewed

Takumi Kotani, Shuji Moriguchi, Kenjiro Terada, Shinsuke Takase, Yu Otake, Yo Fukutani, Masaki Sakuraba

Proceedings of the 7th Asia Conference on Earthquake Engineering　2018
Characterization of Epistemic Uncertainty in River Dike Risk Assessment considering Spatial Distribution of Soil Layer Peer-reviewed

Hiroto KOIDE, Yu OTAKE

Proceedings of the 6th International Symposium on Reliability Engineering and Risk Management (6ISRERM)　927-932　2018
Reliability Assessment for Pile Foundations using Construction Information based on Incomplete Data Peer-reviewed

Yu Otake, Shinya Watanabe

Proceedings of the 6th International Symposium on Reliability Engineering and Risk Management　941-946　2018
Publisher: Research Publishing Services
DOI： 10.3850/978-981-11-2726-7_cgen11 　
Revision of “The Technical Standard for Port Harbor Structures” Based on LRFD Peer-reviewed

Masahiro Takenobu, Masafumi Miyata, Yusuke Honjo, Yu Otake, Takehiko Sato, Satoshi Nishioka

Proceedings of the Geo-Risk2017　514-523　2017
Evaluation of Statistical Estimation Error in an Embankment Stability Problem Peer-reviewed

Yusuke Honjo, Yu Otake

Geotechnical Special Publication　(285)　519-528　2017
Publisher: American Society of Civil Engineers (ASCE)
DOI： 10.1061/9780784480724.047 　

ISSN： 0895-0563
PRODUCTION OF HETEROGENEOUS SPATIAL DISTRIBUTION OF HYDRAULIC CONDUCTIVITY FOR EMBANKMENTS AND ITS APPLICATION TO UNSATURATED SEEPAGE ANALYSIS UNDER RAINFALL CONDITION Peer-reviewed

Ryuji FUKATA, Yosuke HIGO, Yu OHTAKE, Yuki NANNO, Ryosuke KATO

Journal of Japan Society of Civil Engineers, Ser. A2 (Applied Mechanics (AM))　73　(2)　I_791-I_799　2017
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/jscejam.73.i_791 　

ISSN： 2185-4661

eISSN： 2185-4661
EFFECTS OF SPATIAL CHARACTERISTICS OF SLOPE PROPERTIES IN ROCKFALL SIMULATIONS USING DEM Peer-reviewed

UEHARA Naohide, TACHIBANA Ikkoh, KANNO Hasuka, MORIGUCHI Shuji, TERADA Kenjiro, TAKASE Shinsuke, OTAKE Yu

Journal of Japan Society of Civil Engineers, Ser. A2 (Applied Mechanics (AM))　73　(2)　I_507-I_516　2017
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/jscejam.73.I_507 　

eISSN： 2185-4661

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This study presents a numerical study on effects of spatial characteristics of slopes in rockfall simulations using DEM. A series of DEM simulations of a model experiment were performed under the different calcu- lation conditions and different spatial characteristics of slope, and effects of these factors were quantified. Based on the obtained results, it was found the accuracy of the mean values of input parameters is much more important than considering the spatial characteristics. However the conclusion is limited to simulated results obtained in this study, hence more detailed verification is necessary.
BASIC STUDY ON CONCEPT AND APPLICATION OF SPARSE MODELING TO CIVIL ENGINEERING PROBLEMS Peer-reviewed

Ikumasa YOSHIDA, Yosuke TASAKI, Shinnosuke KODAMA, Yu OTAKE

Journal of Japan Society of Civil Engineers, Ser. A2 (Applied Mechanics (AM))　73　(2)　I_55-I_63　2017
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/jscejam.73.i_55 　

eISSN： 2185-4661
IMPROVEMENT OF SUBGRADE REACTION ESTIMATION CONSIDERING DEFORMATION LEVEL AND STRAIN LEVEL Peer-reviewed

Yu OTAKE, Toshiaki NANAZAWA, Yusuke HONJO, Tetsuya KONO, Akinori TANABE

Journal of Japan Society of Civil Engineers, Ser. C (Geosphere Engineering)　73　(4)　412-428　2017
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/jscejge.73.412 　

eISSN： 2185-6516

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 An equivalent linearization analysis based on the elastic beam foundation theory, i.e. spring model, has frequently been used on actual structural foundation designs. A method to convert the nonlinear properties of soil to an equivalent linear model in order to conduct rational calculations is required. The purpose of this study was to examine whether the relationship between the soil strain level and structural deformation level can be used to simplify the model from applicability to actual structural design. From the results, a versatile scheme to set the rational modulus of a subgrade reaction in various structural deformation levels was presented with consideration for the relationship between the structural deformation level and soil strain level.
IMPROVEMENT OF DEFORMATION MODULUS ESTIMATION CONSIDERING SOIL INVESTIGATION TYPES AND STRAIN LEVEL Peer-reviewed

Yu OTAKE, Toshiaki NANAZAWA, Yusuke HONJO, Tetsuya KONO, Akinori TANABE

Journal of Japan Society of Civil Engineers, Ser. C (Geosphere Engineering)　73　(4)　396-411　2017
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/jscejge.73.396 　

eISSN： 2185-6516

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 An equivalent linearization analysis based on the elastic beam foundation theory has frequently been used on actual structural foundation designs. The deformation modulus of soil, which is defined as the secant incline in the stress-strain relationship, is the most important parameter on an equivalent linearization analysis. Specifically, the deformation modulus of soil should be adjusted in accordance with the deformation level of the foundations and the strain level of the soil. In this study, theoretical approaches were conducted with regard to the relationship and consistency between primary soil investigations. Furthermore, strain dependence modeling for the modulus of soil has been considered via a statistical approach using a large-scale soil investigation database conducted at bridge construction sites. From the above considerations, a practical estimation method to evaluate the rational deformation modulus of soil is presented based on soil investigations and SPT-N values.
RELIABILITY ANALYSYS ON STRESS VARIFICATION OF PILED PIER FOCUSING ON THE STASTICAL PROPERTIES OF SHIP BERTHING SPEED Peer-reviewed

Masahiro TAKENOBU, Masafumi MIYATA, Masaru KATSUMATA, Kazuyasu MURAKAMI, Yusuke HONJO, Yu OTAKE

Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering)　73　(2)　I_420-I_425　2017
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/jscejoe.73.i_420 　

eISSN： 2185-4688

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 Partial factors for verification of piled pier stress concerning ships' approach were introduced in the 2007 technical standards for port facility. The partial factors are constant regardless of the design water depth. However, since the statistical properties of the ships' speed depends on the ships size, the failure probability of the piled pier stress is influenced by the design water depth.<br> The purpose of this paper is to propose suitable partial factors reflecting the statistical properties based on actual measured ship's berthing speed, for verification of piled pier stress. We also proposed an analytical method for reliability analysis on the mode applying with modeling of the fender, response surface method, and MCS.
DETERIORATION PREDICTION AND CONTRIBUTION DETECTION FOR HARBOR PIER STRUCTURE CONSIDERING SPATIAL DISTRIBUTION OF UNCERTAINTY SOURCES Peer-reviewed

Yu OTAKE, Takeshi HYODO, Yusuke HONJO, Syusaku KITAZAWA

Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering)　73　(2)　I_396-I_401　2017
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/jscejoe.73.i_396 　

eISSN： 2185-4688

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 It is important to properly predict deterioration process of structures to reasonably make a maintenance plan and management of pier structures. In this research, we consider the effectiveness of the proposed stochastic degradation prediction considering based on actual structural inspection data. Uncertainties to be considered are chloride ion concentration on concrete surface, apparent diffusion coefficient, corrosion occurrence limit of steel material, construction error. In particular, a deterioration prediction model considering as a probability field with respect to chloride ion concentration and apparent diffusion coefficient, which are considered to have spatial correlation is proposed. Finally, the contributions of uncertainty on deterioration prediction are discussed.
ARSENIC RELEASE PROCESSES INTO CONFINED AQUIFERS OF THE SEINO BASINS, NOBI PLAIN, JAPAN Peer-reviewed

Yusuke Kawai, Masahiko Katoh, Ryuki Mori, Yu Otake, Takeshi Sato

Int. J. of GEOMATE　10　(2)　1796-1803　2016
Publisher: The GEOMATE International Society
ISSN： 2186-2982
GEOTECHNICAL RELIABILITY ANALYSIS AND CHALLENGES IN GEOTECHNICAL DESIGN Peer-reviewed

Yu OTAKE, Yusuke HONJO

Journal of Japan Society of Civil Engineers, Ser. C (Geosphere Engineering)　72　(4)　310-326　2016
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/jscejge.72.310 　

eISSN： 2185-6516

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 The authors have developed practical and simplified reliability analysis procedures for geotechnical structures recently. Since reliability analysis has originally developed by structural engineers, there are a number of issues to be customized or specialized for geotechnical reliability problems. By integrating the authors' recent studies, a whole framework of a proposed procedure GRASP (Geotechnical Reliability Analysis by a Simplified Procedure) is explained in this paper. In addition, examples of pile foundation design are presented to demonstrate the effectiveness of the proposed procedure. Furthermore, by summarizing quantitative reliability results by GRASP, future challenges in geotechnical design are pointed out.
NUMERICAL-ANALYSIS-AIDED PROBABILISTIC TSUNAMI HAZARD EVALUATION USING RESPONSE SURFACE Peer-reviewed

Takuma KOTANI, Shinsuke TAKASE, Shuji MORIGUCHI, Kenjiro TERADA, Yo FUKUTANI, Yu OTAKE, Kazuya NOJIMA, Masaaki SAKURABA

Journal of Japan Society of Civil Engineers, Ser. A2 (Applied Mechanics (AM))　72　(1)　58-69　2016
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/jscejam.72.58 　

eISSN： 2185-4661

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 This study presents a new framework of the probabilistic tsunami hazard evaluation which enables us to use numerical simulation effectively. The basic idea of the framework had been proposed for the reliability analysis of geostructures, and the key issue of the framework is use of the response surface which obtained from the results of numerical simulations. In this study, the response surface of the tsunami height is obtained from the results of the tsunami simulation. In addition, uncertainties related to tsunami simulations are quantified. By using the framework, we can create an environment in which the Monte Carlo Simulation can be performed based on highly-developed numerical simulations. The proposed framework is finally applied to the probabilistic evaluation of the tsunami that was induced by the great east Japan earthquake. The probability density distributions of tsunami height at Sendai, Ishinomaki, and Kamaishi were evaluated with consideration of uncertainties of some fault parameters and a modeling error of the numerical simulation. The obtained results indicate that the framework is effective for the probabilistic tsunami hazard evaluation.
個別要素法による落石の確率論的危険度評価 Peer-reviewed

Shuji MORIGUCHI, Yu OTAKE, Shinsuke TAKASE, Kenjiro TERADA, Yuji KOSAKA, Masaru HORIUCHI, Kazuhide SAWADA, Atsushi YASHIMA

Japanese Geotechnical Journal　10　(4)　503-515　2015/12/31
Publisher: The Japanese Geotechnical Society
DOI： 10.3208/jgs.10.503 　

eISSN： 1880-6341
OPTIMAL OBSERVATION LOCATION AND ITS NUMBER BASED ON VALUE OF INFORMATION Peer-reviewed

Ikumasa YOSHIDA, Yu OTAKE, Yusuke HONJO

Journal of Japan Society of Civil Engineers, Ser. A2 (Applied Mechanics (AM))　71　(1)　1-13　2015
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/jscejam.71.1 　

ISSN： 2185-4661

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A methodology to determine optimal observation locations and its number is proposed based on Value of Information (VoI) and probabilistic spatial interpolation method known as Kriging. The risk of decision error is reduced in a decision making problem under uncertainty when new observation information is given. In the proposed method, VoI is defined as the expected reduction of decision error risk. Observation location is determined such that absolute value of VoI is maximized, whereas the number of observation is determined by minimizing the total cost, which is the sum of observation cost and VoI. In the issue that liquefaction countermeasure region along an existing river embankment is determined, locations and the number of additional boring are studied with the proposed method.
A Procedure to Determine Resistance Factors for a Newly Developed Rotation Steel Pile Peer-reviewed

Yu Otake, Yusuke Honjo, Tomohiro Kusano

GEOTECHNICAL SAFETY AND RISK V　340-346　2015

DOI： 10.3233/978-1-61499-580-7-340 　
Continuous River Levee Safety Assessment Based on a Reliability Analysis Peer-reviewed

Yu Otake, Yusuke Honjo, Yuuichi Hiramatsu, Keita Lee, Takeshi Kodaka

GEOTECHNICAL SAFETY AND RISK V　568-573　2015

DOI： 10.3233/978-1-61499-580-7-568 　
On The Inspection of River Levee Safety in Japan by MLIT Peer-reviewed

Yusuke Honjo, Hirotoshi Mori, Masanori Ishihara, Yu Otake

GEOTECHNICAL SAFETY AND RISK V　873-878　2015

DOI： 10.3233/978-1-61499-580-7-873 　
Seismic Risk Management of a Canal System Model Peer-reviewed

Takashi Hara, Tomoo Kato, Maiko Nonoyama, Yu Otake, Yusuke Honjo

GEOTECHNICAL SAFETY AND RISK V　117-122　2015

DOI： 10.3233/978-1-61499-580-7-117 　
基礎構造物の性能設計，第19回地盤パラメータのモデル化 Peer-reviewed

大竹雄

基礎工　43　(4)　114-116　2015
Publisher: 総合土木研究所
ISSN： 0285-5356
A simplified procedure to evaluate the effect of soil variability on geotechnical structures Peer-reviewed

Y. Otake, Y. Honjo

Computer Methods and Recent Advances in Geomechanics　1265-1270　2015
Is soil spatial variability the most important source of uncertainty in geotechnical design? Peer-reviewed

Y. Honjo, Y. Otake

Computer Methods and Recent Advances in Geomechanics　1271-1276　2015
Reliability analysis of long soil retaining wall considering layer thickness uncertainty Peer-reviewed

Y. Honjo, Y. Otake, T. Kusano

LIFE-CYCLE OF STRUCTURAL SYSTEMS: DESIGN, ASSESSMENT, MAINTENANCE AND MANAGEMENT　1370-1377　2015
Bridge health index considering deterioration mechanisms based on statistical analysis of visual inspection data Peer-reviewed

Yu Otake, Yusuke Honjo, Sasuga Takashi, Sato Atsushi

LIFE-CYCLE OF STRUCTURAL SYSTEMS: DESIGN, ASSESSMENT, MAINTENANCE AND MANAGEMENT　1973-1980　2015
AN ESTIMATION METHOD OF A GROUP OF MULTI-OBJECTIVE DETERIORATION CURVES FOR INFRASTRUCTURE Peer-reviewed

Ikumasa YOSHIDA, Yusuke KURATANI, Yu OTAKE, Yusuke HONJO

Journal of Japan Society of Civil Engineers, Ser. A2 (Applied Mechanics (AM))　70　(2)　I_33-I_42　2014
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/jscejam.70.i_33 　

ISSN： 2185-4661

eISSN： 2185-4661

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There are large uncertainties in progress of deterioration of structures depending on their environment and characteristics. This study proposes a method to perform grouping and regression of a group of deterioration curves with respect to age of structure at the same time statistically. The deterioration is expressed by two parameters, i.e, health index and characteristic index. The proposed method can be interpreted as multi-objective regression method with combination of PSO (Paricle Swarm Optimization) method and EM (Expectation Maximization) algorithm. Since heavily deteriorated sutructures tend to have larger uncertainties, the uncertainty around the regression curve is formulated depending on progress of deterioration. The proposed mehod is applied to inspection data about bridges in Gifu prefecture. The result shows good agreement with grouping and regression result performed independently with detailed information.
CHARACTERIZATION OF MODEL ERROR IN GEOTECHNICAL STRUCTURAL DESIGN Peer-reviewed

Yu OTAKE, Yusuke HONJO

Journal of Japan Society of Civil Engineers, Ser. C (Geosphere Engineering)　70　(2)　170-185　2014
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/jscejge.70.170 　

ISSN： 2185-6516

eISSN： 2185-6516

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The purpose of this paper is to comprehensively quantify model error in geotechnical structural design methods, e.g. structural foundations, earth structures and retaining walls. Model errors for structural foundations and earth structures are summarized based on an extensive review of literature, and model errors in retaining walls are quantified in detail by statistical analysis based on collecting actual construction data and model experiment data. From the above, the basic information for conducting a geotechnical reliability analysis is presented. Furthermore, the challenges in geotechnical structural design are indicated from a model error perspective.
CHARACTERIZATION OF TRANSFORMATION ERROR IN GEOTECHNICAL STRUCTURAL DESIGN Peer-reviewed

Yu OTAKE, Yusuke HONJO

Journal of Japan Society of Civil Engineers, Ser. C (Geosphere Engineering)　70　(2)　186-198　2014
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/jscejge.70.186 　

ISSN： 2185-6516

eISSN： 2185-6516

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In geotechnical structural design, it is very common to transform the measurements obtained in soil investigations, such as SPT-N or CPT-qc, into geotechnical parameters that are directly used in design calculations. The error of these transformations, i.e. transformation errors, is one of the characteristic sources of uncertainty in geotechnical design, and it generally imposes quite a large uncertainty due to its dependence on past experience. The purpose of this paper is to extensively quantify the transformation error in geotechnical structural design through a review of available literature. Furthermore, the practical applicability of these transformation formulas is examined based on a comparison with spatial variability and statistical estimation errors in measurements such as SPT-N.
Simplified health indices for bridges based on statistical analyses of bridge inspection data by Gifu prefecture Peer-reviewed

Honjo Yusuke, Otake Yu, Sato Atsushi, Sasuga Takashi, Kobayashi Kouichi, Sohmiya Hiroo

Kozo Kogaku Ronbunshu. A (Journal of Structural Engineering. A)　Vo.60　(A)　462-474　2014
Publisher: Japan Society of Civil Engineers
DOI： 10.11532/structcivil.60A.462 　

ISSN： 1881-6614

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Simplified bridge health indices for RC deck, RC beam, PC beam and steel beam are proposed that take into account the deterioration mechanisms based on the statistical analysis of the bridge inspection data for 1200 bridges between 2001 and 2006 by Gifu prefecture. The inspection data were statistically analyzed by the principle components analysis and the cluster analysis, where the results are interpreted carefully by referring to the pictures taken at the time of the inspection to identify the deterioration mechanisms. Furthermore, the changes of the design codes and the construction details are considered in interpreting the results. One of the distinguished characteristics of the proposed health indices for each part is that they consist of 2 indices: the first one measures the general deterioration of each part, whereas the second one indicates the responsible deterioration mechanism.
Verification of a reliability analysis for long continuous structure considering investigation sites on the 20km-long river dike incurred the earthquake disaster Peer-reviewed

Yu OTAKE, Yusuke HONJO, Yuichi HIRAMATSU, Ikumasa YOSHIDA, Shunsuke SAKO, Osamu NAKAYAMA, Takuro NAGANO

Japanese Geotechnical Journal　9　(2)　203-217　2014
Publisher: The Japanese Geotechnical Society
DOI： 10.3208/jgs.9.203 　

eISSN： 1880-6341
DEVELOPMENT OF GEOTECHNICAL RELIABILITY ANALYSIS METHOD BY A SIMPLIFIED PROCEDURE AND ITS APPLICATION TO SHALLOW FOUNDATIONS

Yusuke HONJO, Yu OTAKE

Journal of Japan Society of Civil Engineers, Ser. C (Geosphere Engineering)　70　(4)　372-386　2014
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/jscejge.70.372 　

ISSN： 2185-6516

eISSN： 2185-6516

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The authors have tried to develop a practical and a simplified reliability analysis procedure for geotechnical structures. Since the reliability analysis has been developed basically by the structural engineers, there remain a number of points that need to be developed for geotechnical reliability analysis. In this paper, basic works done by the authors are integrated to show the full picture of a proposed procedure called GRASP, which stands for Geotechnical Reliability Analysis by a Simplified Procedure. In the latter half of the paper, the proposed procedure is applied to the reliability analysis of shallow foundations to demonstrate its effectiveness and usefulness in engineering practice. The calculated results show some weaknesses to be improved in the current design practice.
Consideration on Major Uncertainty Sources in Geotechnical Design Peer-reviewed

Y. Honjo, Y. Otake

Vulnerability, Uncertainty, and Risk: Quantification, Mitigation, and Management - Proceedings of the 2nd International Conference on Vulnerability and Risk Analysis and Management, ICVRAM 2014 and the 6th International Symposium on Uncertainty Modeling and Analysis, ISUMA 2014　2488-2497　2014
Publisher: American Society of Civil Engineers (ASCE)
DOI： 10.1061/9780784413609.250 　
A Group of Deterioration Curves of Bridges Estimated by Extended em Algorithm Peer-reviewed

I. Yoshida, Y. Otake, Y. Honjo

Vulnerability, Uncertainty, and Risk: Quantification, Mitigation, and Management - Proceedings of the 2nd International Conference on Vulnerability and Risk Analysis and Management, ICVRAM 2014 and the 6th International Symposium on Uncertainty Modeling and Analysis, ISUMA 2014　409-418　2014
Publisher: American Society of Civil Engineers (ASCE)
DOI： 10.1061/9780784413609.042 　
Reliability Analysis of Long River Dike Against Liquefaction Failure Peer-reviewed

Y. Otake, Y. Honjo, Y. Hiramatsu, M. Mase, I. Yoshida

Vulnerability, Uncertainty, and Risk: Quantification, Mitigation, and Management - Proceedings of the 2nd International Conference on Vulnerability and Risk Analysis and Management, ICVRAM 2014 and the 6th International Symposium on Uncertainty Modeling and Analysis, ISUMA 2014　2409-2418　2014
Publisher: American Society of Civil Engineers (ASCE)
DOI： 10.1061/9780784413609.242 　
Optimal Sampling Placement Based on Value of Information Peer-reviewed

I. Yoshida, Y. Otake, Y. Honjo

Proc. of Life-Cycle of Structural Systems, Furuta, Frangopol and Akiyama eds　1363-1369　2014
A STUDY ON EFFICIENT MAINTENANCE OF RC DECK IN OPEN-TYPE WHARF BY KRIGING METHOD Peer-reviewed

Takeshi HYODO, Shinichiro KITAZATO, Yusuke HONJO, Yu OTAKE

Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering)　69　(2)　I_191-I_196　2013
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/jscejoe.69.i_191 　

ISSN： 2185-4688

eISSN： 2185-4688

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Since port structures are exposed in the severe natural condition, it is difficult to estimate the deterioration of components of port structures frequently. This paper presents the more effective procedure for efficient maintenance of RC deck in open-type wharf. Kriging method, a typical method in geostatistics, was applied in this study to estimate the deterioration of a target RC deck using inspection data such as deterioration degree from visual inspection and concrete chloride ion tested from in-situ samples. The results show that Kriging method is useful to figure out the distribution of concrete chloride ion and to predict the deterioration process.
AN IDENTIFICATION METHOD OF A GROUP OF DETERIORATION CURVE BY EM ALGORITHM Peer-reviewed

Ikumasa YOSHIDA, Yusuke HONJO, Yu OTAKE

Journal of Japan Society of Civil Engineers, Ser. A1 (Structural Engineering ^|^ Earthquake Engineering (SE/EE))　69　(2)　174-185　2013
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/jscejseee.69.174 　

eISSN： 2185-4653
A simple method to assess the effects of soil spatial variability on the performance of a shallow foundation Peer-reviewed

Yusuke Honjo, Yu Otake

Geotechnical Special Publication　No.229　(229)　385-404　2013

DOI： 10.1061/9780784412763 　

ISSN： 0895-0563
分散型粒子群最適化DPSOを用いた劣化曲線群算定アルゴリズムの提案 Peer-reviewed

吉田郁政, 澤田智貴, 小泉晶太郎, 大竹雄, 本城勇介

土木学会論文集A2(応用力学)　Vol.69　(No.2)　39-47　2013
A framework of rockfall hazard evaluation using DEM with consideration of uncertainties Peer-reviewed

Vol.18　4p　2013
Publisher:
Serious damage occurrence probability in an existing estuary dam during future earthquakes Peer-reviewed

T. Kato, A. Nishida, H. Yukimoto, T. Hara, M. Iwata, Y. Otake, Y. Honjo

Proc. of The 11th International Conference on Structural Safety and Reliability (ICOSSAR2013), G. Deodatis, B.R. Ellingwood and D.M. Frangopol eds　2279-2286　2013
Statistical estimation error evaluation theory of local averages of geotechnical parameters Peer-reviewed

Y. Honjo, Y. Otake

Proc. of The 11th International Conference on Structural Safety and Reliability (ICOSSAR2013), G. Deodatis, B.R. Ellingwood and D.M. Frangopol eds　1987-1994　2013
A simplified reliability of spatial variability employing local average of geotechnical parameters Peer-reviewed

Y. Otake, Y. Honjo

Proc. of The 11th International Conference on Structural Safety and Reliability (ICOSSAR2013), G. Deodatis, B.R. Ellingwood and D.M. Frangopol eds　1995-2002　2013
Statistical study on identification of bridge deterioration mechanism based on visual inspection database Peer-reviewed

Y. Otake, Y. Honjo, T. Sasuga

Proc. of The 11th International Conference on Structural Safety and Reliability (ICOSSAR2013), G. Deodatis, B.R. Ellingwood and D.M. Frangopol eds　2587-3592　2013
Seismic damage occurrence probability in an existing estuary dam Peer-reviewed

T. Hara, M. Iwata, Y. Otake, Y.Honjo, T. Kato, A. Nishida, H. Yukimoto

Proc. of the Geotechnical Safety and Risk Ⅳ, L.M. Zhang, Y. Wang, G. Wang and D.Q.Li eds　263-269　2013
Rockfall risk management based on survey data of real slope Peer-reviewed

S.Moriguchi, Y. Otake, M. Iwata, Y. Honjo, A. Takagi, F. Kurauchi, T. Hara, K. Sawada, A. Yashima, N. Asano

Proc. of the Geotechnical Safety and Risk Ⅳ, L.M. Zhang, Y. Wang, G. Wang and D.Q.Li eds　499-504　2013
Reliability analysis of 640m long soil retaining wall for an embedded highway construction Peer-reviewed

Y.Honjo, Y. Otake, K. Kusano, T. Hara

Proc. of the Geotechnical Safety and Risk Ⅳ, L.M. Zhang, Y. Wang, G. Wang and D.Q.Li eds　121-126　2013
Reliability analysis of 20-km river dike against liquefaction failure Peer-reviewed

Y.Otake, Y. Honjo, Y. Hiramatsu

Proc. of the Geotechnical Safety and Risk Ⅳ, L.M. Zhang, Y. Wang, G. Wang and D.Q.Li eds　299-304　2013
地盤工学技術者のための確率統計入門：5. 確率過程と確率場 Peer-reviewed

本城勇介, 大竹雄

地盤工学会誌　61　(1)　48-55　2013
Publisher: 地盤工学会
ISSN： 1882-7276
Risk Management of Infrastructures on Road Network in Hida Area Peer-reviewed

Shuji MORIGUCHI, Yu OTAKE, Maiko IWATA, Akiyoshi TAKAGI, Fumitaka KURAUCHI, Yusuke HONJO

Internet Journal of Society for Social Management Systems　8　(1)　SMS12-7979　2012

ISSN： 2432-552X
地盤パラメータ局所平均の空間的ばらつきと統計的推定誤差の簡易評価理論 Peer-reviewed

本城勇介, 大竹雄, 加藤栄和

土木学会論文集C(地圏工学)　Vol.68　(No.1)　41-55　2012

DOI： 10.2208/jscejge.68.41 　
応答曲面を用いた実用的な地盤構造物の信頼性設計法：液状化地盤上水路の耐震設計への適用 Peer-reviewed

大竹雄, 本城勇介

土木学会論文集C(地圏工学)　Vol.68　(No.1)　68-83　2012

DOI： 10.2208/jscejge.68.68 　
調査地点を考慮した長大水路の液状化危険度解析 Peer-reviewed

大竹雄, 本城勇介, 小池健介

地盤工学ジャーナル　Vol.7　(No.1)　283-293　2012

DOI： 10.3208/jgs.7.283 　
Reliability based design on long irrigation channel considering the soil investigation locations Peer-reviewed

Y. Otake, Y. Honjo

Geotechnical Special Publication　No.231　(225)　2836-2845　2012

DOI： 10.1061/9780784412121.290 　

ISSN： 0895-0563
VERIFICATION OF A SIMPLIFIED GEOTECHNICAL RELIABILITY ANALYSIS SCHEME OF SPATIAL VARIABILITY BASED ON LOCAL AVERAGE OF GEOTECHNICAL PARAMETERS Peer-reviewed

Yu OTAKE, Yusuke HONJO

Journal of Japan Society of Civil Engineers, Ser. C (Geosphere Engineering)　68　(3)　475-490　2012
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/jscejge.68.475 　

eISSN： 2185-6516
VERIFICATION OF STATISTICAL ESTIMATION ERROR EVALUATION THEORY OF LOCAL AVERAGES OF GEOTECHNICAL PARAMETERS Peer-reviewed

Yusuke HONJO, Yu OTAKE

Journal of Japan Society of Civil Engineers, Ser. C (Geosphere Engineering)　68　(3)　491-507　2012
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/jscejge.68.491 　

eISSN： 2185-6516
橋梁点検データベースの統計解析に基づく劣化機構を考慮した鋼橋RC床板の健全度評価 Peer-reviewed

大竹雄, 流石尭, 小林孝一, 本城勇介

土木学会論文集A(構造・地震工学)　Vol.68　(No.3)　638-695　2012
A risk management scheme of rockfall accidents in northern Gifu prefecture Japan Peer-reviewed

T.Hara, Y.Honjo, A.Takagi, F.Kurauchi, S.Moriguchi, Y.Otake

Proc. the 5th Asian-Pacific Symposium on Structural Reliability and its Applications (APPSSRA)，K.K. Phoon, M. Beer, S.T. Quek, S.D. Pang eds　506-511　2012
Statistical study on evaluating bridge health index based on bridge inspection database Peer-reviewed

Y.Otake, Y.Honjo, T.Sasuga

Proc. the 5th Asian-Pacific Symposium on Structural Reliability and its Applications (APPSSRA)，K.K. Phoon, M. Beer, S.T. Quek, S.D. Pang eds　362-367　2012
General and local estimation of local average of geotechnical parameters in reliability analysis Peer-reviewed

Y.Honjo, Y.Otake

Proc. the 5th Asian-Pacific Symposium on Structural Reliability and its Applications (APPSSRA)，K.K. Phoon, M. Beer, S.T. Quek, S.D. Pang eds　236-241　2012
統計的手法を用いた橋梁点検データベースに基づく橋梁健全度評価に関する基礎的研究 Peer-reviewed

大竹雄, 流石尭, 本城勇介, 村上茂之, 小林孝一

土木学会論文集A2(応用力学)　Vo.67　(No.2)　813-824　2011
ETC10例題のレベルⅢ信頼性設計 Peer-reviewed

本城勇介, 大竹雄, 原隆史

構造物の安全性信頼性　Vol.7　615-622　2011
ANALYSIS CONCEPTS FOR SEISMIC RELIABILITY OF GEOGRID REINFORCED SOIL WALL Peer-reviewed

HARA Takashi, MIYATA Yoshihisa, OTAKE Yu

Proceedings of geosynthetics symposium　26　(第26巻)　41-46　2011
Publisher: Japan Chapter of International Geosynthetics Society
DOI： 10.5030/jcigsjournal.26.41 　

ISSN： 1344-6193

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The developments of design codes grounded on the reliability based design (RBD) are actively taking place in various part of the world today. RBD is considered to become the central tool of the design code developments. Under the situation, the importance of the reliability analysis of the structure in design increases though, study on seismic reliability analysis of reinforced soil wall is few. Therefore a study on analysis concepts for seismic reliability of geogrid reinforced soil wall has been conducted by authors. An approach of the seismic reliability analysis is introduced and future issues of the analysis concepts are discussed in this paper
Application of reliability based design (RBD) to Eurocode 7 Peer-reviewed

T. Hara, Y. Honjo, Y. Otake, S. Moriguchi

Proc. of the 3rd International Symposium on Geotechnical Safety and Risk (IS-GSR2011), N.Vogt, B.Schuppener, D.Straub, G.Brau eds,　489-496　2011
LevelⅢ Reliability based design employing numerical analysis –Application of RBD to DEM- Peer-reviewed

S. Moriguchi, Y. Honjo, T. Hara, Y. Otake

Proc. of the 3rd International Symposium on Geotechnical Safety and Risk (IS-GSR2011), N.Vogt, B.Schuppener, D.Straub, G.Brau eds　369-375　2011
LevelⅢ Reliability based design employing numerical analysis –Application of RBD to FEM- Peer-reviewed

Y. Otake, Y. Honjo, T. Hara, S. Moriguchi

Proc. of the 3rd International Symposium on Geotechnical Safety and Risk (IS-GSR2011), N.Vogt, B.Schuppener, D.Straub, G.Brau eds　359-367　2011
Road slopes risk assessment of the northern part of Gifu Prefecture, Japan Peer-reviewed

Yusuke Honjo, Yu Otake, Shuzi Moriguchi, Takashi Hara

Geotechnical Special Publication　(224)　988-995　2011

DOI： 10.1061/41183(418)107 　

ISSN： 0895-0563
個別要素法により挙動を考慮した落石対策に関する信頼性設計に向けた提案 Peer-reviewed

森口周二, 大竹雄, 本城勇介, 原隆史, 沢田和秀

第23回中部地盤工学シンポジウム論文集　37-42　2011
INDEPENDENT REINFORCED SOIL STRUCTURE WITH PILE FOUNDATION -PILED GEO-WALL: AN EXPERIMENTAL STUDY ON THE APPLICATION TO SEISMIC MEASURE FOR EMBANKMENT- Peer-reviewed

Takashi Hara, Shinichiro Tsuji, Atsushi Yashima, Kazuhide Sawada, Naoki Tatta, Yu Otake

SOILS AND FOUNDATIONS　50　(5)　565-571　2010/10

DOI： 10.3208/sandf.50.565 　

ISSN： 0038-0806
Analytical study on a liquefaction countermeasure for flume channel by sheet-pile with drain

Kazutaka OTSUSHI, Yu Otake, Tomoo KATO, Takashi HARA, Atsushi YASHIMA

Jiban Kogaku Janaru (Japanese Geotechnical Journal)　5　(4)　569-587　2010
Publisher: The Japanese Geotechnical Society
DOI： 10.3208/jgs.5.569 　

eISSN： 1880-6341
Experimental study on a liquefaction countermeasure for flume channel using sheet-pile with drain

Kazutaka OTSUSHI, Tomoo KATO, Takashi HARA, Atsushi YASHIMA, Yu OTAKE

Jiban Kogaku Janaru (Japanese Geotechnical Journal)　5　(1)　19-33　2010
Publisher: The Japanese Geotechnical Society
DOI： 10.3208/jgs.5.19 　

eISSN： 1880-6341
排水機能付き矢板を用いたフルーム開水路の液状化対策に関する解析的研究 Peer-reviewed

乙志和孝, 大竹雄, 加藤智雄, 原隆史, 八嶋厚

地盤工学ジャーナル　Vol.5　(No.4)　569-587　2010
STUDY ON A LIQUEFACTION COUNTERMEASURE FOR WATER CHANNEL USING SHEET-PILE WITH DRAIN Peer-reviewed

K. Otsushi, H. Tanaka, T. Kato, T. Hara, A. Yashima, Y. Otake

RECENT DEVELOPMENTS OF GEOTECHNICAL ENGINEERING　558-563　2010
Analytical study on mitigation of liquefaction-related damage to flume channel using sheet-pile with drain Peer-reviewed

K. Otsushi, T. Kato, T. Hara, A. Yashima, Y. Otake, K. Sakanashi, A. Honda

Geotechnical Special Publication　(199)　3062-3071　2010

DOI： 10.1061/41095(365)312 　

ISSN： 0895-0563
STUDY ON A LIQUEFACTION COUNTERMEASURE FOR FLUME STRUCTURE BY SHEET-PILE WITH DRAIN Peer-reviewed

Kazutaka Otsushi, Tomoo Kato, Takashi Hara, Atsushi Yashima, Yu Otake, Kazuhiko Sakanashi, Ayumi Honda

GROUND IMPROVEMENT TECHNOLOGIES AND CASE HISTORIES　437-443　2010

DOI： 10.3850/GI123 　
排水機能付き鋼矢板を用いたフルーム開水路の液状化対策に関する実験的研究 Peer-reviewed

乙志和孝, 加藤智雄, 原隆史, 八嶋厚, 大竹雄

地盤工学ジャーナル　Vol.5　(No.1)　19-33　2009
液状化地盤におけるフルーム水路の地震時残留変形の簡易推定 Peer-reviewed

大竹雄, 加藤智雄, 坂梨和彦, 本多亜佑美, 原隆史, 八嶋厚, 乙志和孝

第54回地盤工学シンポジウム論文集　385-390　2009
地震動強さの距離減衰式にみられるバラツキに関する基礎的分析 Peer-reviewed

翠川三郎, 大竹雄

日本地震工学会論文集　第3巻　(第1号)　59-70　2003
震源深さによる距離減衰特性の違いを考慮した地震動最大加速度・最大速度の距離減衰式 Peer-reviewed

翠川三郎, 大竹雄

第11回日本地震工学シンポジウム論文集　609-614　2002
Seismic performance based design for canal embankment Proc. of International symposium on New Generation Design Code for Geoengineering Peer-reviewed

Y.Otake, T.Hara, T.Horikawa, Y.Ito, T.Kato, M.Hosoyamada, Y.Kasai

Design Practice (TAIPEI 2006)　1-12　2002

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Misc. 30

ベイズ推定に基づくシナリオ合成によるリアルタイム津波予測手法—Real-time Tsunami Forecast with Scenario Superposition using Bayesian Approach

藤田真粹, 野村怜佳, 森口周二, 大竹雄, Randall J. LeVeque

計算工学講演会論文集 = Proceedings of the Conference on Computational Engineering and Science / 日本計算工学会編　29　1367-1371　2024/06
Publisher: 東京 : 日本計算工学会
Basic Study on Prediction of Differential Settlement by DMDc and Kalman Filter

堀田海陽, 吉田郁政, 大竹雄, 高野大樹

AI・データサイエンス論文集(Web)　5　(1)　2024

ISSN： 2435-9262
ロバスト主成分分析に基づく沖合津波観測点配置の最適化—Optimization of Offshore Gauge Configuration with Robust Principal Component Analysis

藤田真粹, 野村怜佳, 大竹雄, 越村俊一, 森口周二, 寺田賢二郎

計算工学講演会論文集 = Proceedings of the Conference on Computational Engineering and Science / 日本計算工学会編　28　79-82　2023/05
Publisher: 日本計算工学会
多様なシナリオデータベースの融合による津波リスク同定—Tsunami risk evaluation by the combined use of heterogenous datasets

野村怜佳, 大竹雄, 森口周二, 越村俊一, Randall J. LeVeque, 寺田賢二郎

計算工学講演会論文集 = Proceedings of the Conference on Computational Engineering and Science / 日本計算工学会編　28　83-86　2023/05
Publisher: 日本計算工学会
Fundamental study of Prediction of Consolidation Settlement of Offshore Airport Runway by DMD

堀田海陽, 中村朋佳, 吉田郁政, 大竹雄, 高野大樹

土木学会全国大会年次学術講演会(Web)　78th　2023
River health assessment method with Fourier basis for river flow path control CPS

高橋勇希, 安田浩保, 早坂圭司, 大竹雄, 村松正吾

電子情報通信学会大会講演論文集(CD-ROM)　2022　2022

ISSN： 1349-144X
Prediction of River Water Level Distribution by Graph Dynamic Mode Decomposition with Elevation Difference

北村帆高, 新井裕介, 村松正吾, 安田浩保, 早坂圭司, 大竹雄

電子情報通信学会大会講演論文集(CD-ROM)　2022　2022

ISSN： 1349-144X
On reasonable observation periods in the sequential real-time tsunami risk assessment based on POD technique

VERMARE Louise A. Hirao, FUJITA Saneiki, NOMURA Reika, OTAKE Yu, MORIGUCHI Shuji, TERADA Kenjiro, LEVEQUE Randall J.

計算工学講演会論文集(CD-ROM)　27　2022

ISSN： 1342-145X
Gauge Configuration Optimization for Real-time Tsunami Forecast with POD

藤田真粹, 野村怜佳, 越村俊一, 大竹雄, 森口周二, 寺田賢二郎, 高瀬慎介, 福谷陽, 桜庭雅明, 野島和也, 橋詰正広

計算工学講演会論文集(CD-ROM)　27　2022

ISSN： 1342-145X
モード分解に基づく代理モデルによる津波流体力のリアルタイム予測—Real-time Tsunami Force Prediction by Mode Decomposition-Based Surrogate Modeling

外里健太, 高瀬慎介, 森口周二, 寺田賢二郎, 大竹雄, 福谷陽, 野島和也, 櫻庭雅明, 横洲弘武

計算工学講演会論文集 = Proceedings of the Conference on Computational Engineering and Science / 日本計算工学会編　26　278-282　2021/06
Publisher: 日本計算工学会
Realtime tsunami risk estimation approach development using particle filter

26　487-490　2021/06
Publisher: 日本計算工学会
地盤調査法の高度化等を考慮した道路橋基礎の部分係数設計法に関する共同研究報告書

桐山孝晴, 七澤利明, 七澤利明, 堀内智司, 河野哲也, 河野哲也, 飯島翔一, 中浦慎之介, 藤村彰, 藤村彰, 本城勇介, 大竹雄, 大竹雄

土木研究所共同研究報告書　(544)　2021

ISSN： 0386-5878
PROTOTYPE CONSTRUCTION OF ACTIVE RIVER CHANNEL CONTROL SYSTEM

ZHANG Chen, 内藤勇鷹, 村松正吾, 安田浩保, 早坂圭司, 大竹雄

電子情報通信学会大会講演論文集(CD-ROM)　2021　2021

ISSN： 1349-144X
河道能動制御CPSのプロトタイプ構築のための流路健全性指標の検討

井上大輝, CHEN Zhang, LIU Dongqi, 村松正吾, 安田浩保, 早坂圭司, 大竹雄

映像情報メディア学会技術報告　45　(23(ME2021 71-87))　2021

ISSN： 1342-6893
固有直交分解を用いたリアルタイム津波シミュレーション—Real-time tsunami simulation using Proper Orthogonal Decomposition

外里健太, 高瀬慎介, 森口周二, 寺田賢二郎, 大竹雄, 福谷陽, 野島和也, 櫻庭雅明, 横洲弘武

計算工学講演会論文集 = Proceedings of the Conference on Computational Engineering and Science / 日本計算工学会編　25　6p　2020/06
Publisher: 日本計算工学会
Performance Evaluation of Convolutional-Sparse-Coded Dynamic Mode Decomposition in River Groynes Model Experimnent

新井裕介, 金子侑平, 村松正吾, 安田浩保, 早坂圭司, 大竹雄

電子情報通信学会技術研究報告　119　(440(SIP2019 103-169))　2020

ISSN： 0913-5685
河川流路変動の解明と制御のためのサイバーフィジカルプロトタイプシステム構築

内藤勇鷹, 村松正吾, 安田浩保, 早坂圭司, 大竹雄

映像情報メディア学会技術報告　44　(20(ME2020 88-101))　2020

ISSN： 1342-6893
数値解析結果の空間モード分解による津波のリスク評価—Tsunami risk assessment using spatial modes extracted from results of numerical analysis

外里健太, 小谷拓磨, 森口周二, 寺田賢二郎, 大竹雄

計算工学講演会論文集 = Proceedings of the Conference on Computational Engineering and Science / 日本計算工学会編　24　4p　2019/05
Publisher: 日本計算工学会
畳込みスパース符号化を利用した拡張動的モード分解

Hiroyasu YASUDA

第33回信号処理シンポジウム　2018/11
モンテカルロシミュレーションを用いた簡易な部分係数の設定方法

岩瀬智恵, 大竹雄, 本城勇介, 吉田郁政

土木学会年次学術講演会講演概要集(CD-ROM)　73rd　ROMBUNNO.III‐073　2018/08/01
実杭の水平載荷試験から得られた水平地盤反力係数の非線形特性

笠原康平, 佐名川太亮, 西岡英俊, 大竹雄, 大木拓馬

土木学会年次学術講演会講演概要集(CD-ROM)　73rd　2018
洗掘被害を受けた直接基礎の残存支持力のベイズ推定法の提案

西岡英俊, 佐名川太亮, 黒木悠輔, 大竹雄

土木学会年次学術講演会講演概要集(CD-ROM)　73rd　2018
構造物基礎の等価線形解析における汎用的な地盤反力係数の設定

中村鴻介, 大竹雄, 本城勇介, 七澤利明, 河野哲也

土木学会年次学術講演会講演概要集(CD-ROM)　73rd　2018
道路橋示方書の改定を踏まえた性能設計概念に基づく設計照査手法についての研究開発

七澤利明, 河野哲也, 田辺晶規, 田辺晶規, 大竹雄, 本城雄介

土木研究所共同研究報告書　(499)　2018

ISSN： 0386-5878
Effects of uncertainties of slope in rockfall simulations

22　5p　2017/05
Publisher: 日本計算工学会
簡易載荷試験に基づく既設杭の性能評価へ向けた基礎的研究

大木拓馬, 大竹雄, 西岡英俊, 佐名川太亮

土木学会年次学術講演会講演概要集(CD-ROM)　72nd　2017
基礎の着目変位レベルに応じた地盤反力係数の推定方法

大竹雄, 七澤利明, 本城勇介, 河野哲也, 田辺晶規

土木学会年次学術講演会講演概要集(CD-ROM)　71st　2016
Reliability on the stability of long continuous earth-structures Peer-reviewed

T. Hara, M. Nonoyama, Y. Otake, Y. Honjo

Geotechnics for Catastrophic Flooding Events - Proceedings of the 4th International Conference on Geotechnical Engineering for Disaster Mitigation and Rehabilation, GEDMAR 2014　239-246　2015/01/01
地盤工学会論文賞(和文部門)を受賞して(1)(学会の動き)

大竹雄, 本城勇介, 平松佑一, 吉田郁政, 佐古俊介, 中山修, 長野拓朗

地盤工学会誌　63　(8)　51-51　2015
Publisher: 地盤工学会
地盤工学会論文賞(和文部門)を受賞して

大竹雄, 本城勇介, 小池健介

地盤工学会誌 = / the Japanese Geotechnical Society　61　(8)　54-54　2013/08/01
Publisher: 地盤工学会
ISSN： 1882-7276

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Books and Other Publications 15

土木構造物共通示方書

土木学会構造工学委員会土木構造物共通示方書改訂小委員会

土木学会,丸善出版 (発売)　2024/03

ISBN: 9784810610611
基礎工4月号地盤物性のばらつきを考慮した確率論的手法や解析的手法を用いた評価

大竹雄

2024
地盤工学会誌技術手帳自己相関距離

地盤工学会　2022
杭基礎施工便覧

日本道路協会

日本道路協会,丸善出版 (発売)　2020/09

ISBN: 9784889502923
杭基礎設計便覧

日本道路協会

日本道路協会,丸善出版 (発売)　2020/09

ISBN: 9784889502916
河川堤防の調査・検討から維持管理まで

地盤工学会河川堤防の調査・検討から維持管理まで編集委員会, 地盤工学会

地盤工学会,丸善出版 (発売)　2020/03

ISBN: 9784886449320
信頼性設計法と性能設計の理念と実際 : 地盤構造物を中心として

本城, 勇介, 大竹, 雄

技報堂出版　2018/12

ISBN: 9784765518598
構造工学シリーズ28 信頼性設計法に基づく土木構造物の性能照査ガイドライン

土木学会構造工学委員会設計基準体系における安全性照査ガイドライン策定小委員会

土木学会,丸善出版 (発売)　2018/10

ISBN: 9784810609639
港湾の施設の技術上の基準・同解説

日本湾岸協会

日本湾岸協会　2018/07
道路橋示方書・同解説 Ⅳ下部構造編

日本道路協会

日本道路協会,丸善 (発売)　2017/11

ISBN: 9784889502794
構造工学シリーズ25 橋梁の維持管理 : 実践と方法論

土木学会構造工学委員会橋梁の維持管理システム研究小委員会

土木学会,丸善出版 (発売)　2016/06

ISBN: 9784810609219
infrastructure maintenance

2015/12

ISBN: 9784810608588
Databases for Data-Centric Geotechnics: Geotechnical Structures, Chapter 9

Taylor & Francis
Uncertainty, Modelling, and Decision Making in Geotechnics, Chapter 8

Taylor & Francis
Databases for Data-Centric Geotechnics: Site Characterization, Chapter 12

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Presentations 47

不確実性下の意思決定：課題抽出とデータ駆動への期待 Invited

応用力学講演会 2020　2020/11/11
データ駆動型の動的信頼性設計 Invited

京都大学学術情報メディアセンターセミナー「現象の不確実性と数値シミュレーション」　2020/10/22
地質・地形・地盤調査法 Invited

令和2年度国土交通大学校道路構造物〔基礎〕研修オンライン開催　2020/10/01
防災とデータサイエンス〜不確実な災害への対応〜 Invited

土木の日特別行事防災に関するシンポジウム　2019/11/17
変化する社会と建設業 Invited

女性・若手で考える建設産業の未来の集い　2019/11/07
地質・地形・地盤調査法 Invited

令和元年度国土交通大学校道路構造物〔基礎〕研修　2019/10/04
データサイエンスと土木設計 Invited

株式会社日建設計シビル設計技術連絡会　2019/09/01
逆問題サマースクール Invited

土木学会応用力学小委員会逆問題小委員会　2019/04/25
データサイエンスを活用した設計施工の未来 Invited

ME新潟の会技術講習会　2019/04/20
実務者のための土と基礎の設計計算演習講習会(構造物基礎編) Invited

公益社団法人地盤工学会　2019/03/27
データ駆動型・性能評価 Invited

東北大土木工学の将来に関する勉強会・意見交換会　2019/03/22
データ駆動型の新しい設計体系の構築へ向けて Invited

国土交通省国土技術政策総合研究所データサイエンスおよびV&V勉強会　2019/01/29
河川堤防のリスク評価 Invited

東京都都市大リスクマネジメントセミナー第7回一般インフラ施設のリスクマネジメントの実践　2019/01/25
統計学の基礎と信頼性設計-伝統的な理論とこれから- Invited

非線形CAE勉強会特定非営利活動法人非線形CAE協会　2018/12/22
地質・地形・地盤調査法 Invited

平成30年度国土交通大学校道路構造物〔基礎〕研修　2018/10/04
土木設計における不確実性にどう対応するか－信頼性設計から Invited

技術士会北陸支部技術講習会「不確実性に専門技術者はどう対応すべきか公益性を確保するための技術者の役割と責任（技術者倫理）」　2018/02/20
地盤構造物への信頼性設計法の運用 Invited

地盤工学会東北支部地盤工学フォーラム東北2017　2018/01/24
地形・地質・地盤調査 Invited

平成29年度国土交通大学校道路構物〔基礎〕研修　2017/09/25
「設計コードの国内外の動向」「R言語を用いた信頼性解析」 Invited

株式会社日本水工コンサルタント新構造設計に関わる講演・講習会　2017/09/19
性能設計概念と信頼性設計 Invited

地盤工学会北陸支部平成29年度第1回ジオテクセミナー　2017/07/31
地盤工学の視点からみた河川堤防の信頼性解析とリスク評価 Invited

国土交通省北陸地方整備局信濃川下流河川事務所技術講習会　2017/02/28
地盤構造物の信頼性解析体系の構築〜V&Vとの関連を中心として Invited

関東地区応用力学フォーラム〜土木分野のV&Vに向けての実践的アプローチ～，公益社団法人土木学会応用力学委員　2016/12/22
モニタリングに基づく地盤構造物挙動のValidation信頼性理論と逆解析の応用 Invited

CIM JAPAN2016，伊藤忠テクノソリューションズ株式会社　2016/11/22
地形・地質・地盤調査法 Invited

平成28年度国土交通大学校道路構造物〔基礎〕研修　2016/11/11
線状構造物の信頼性解析-河川堤防を中心として Invited

堤防委員会一般財団法人国土技術研究センター　2016/11/11
逆問題スプリングスクール土木工学における観測・計測データ活用のフロンティア Invited

「逆問題の基礎的例題」「R言語による実習」土木学会応用力学小委員会逆問題小委員会　2016/03/04
地盤構造物の信頼性解析法の開発-不確実性の評価と地盤解析技術 Invited

Soil Plus 耐震解析セミナー2015 伊藤忠テクノソリューションズ株式会社　2015/11/25
地盤構造物の簡易信頼性解析法の応用

地盤・地中構造物解析セミナー JIPテクノサイエンス株式会社　2015/11/19
基礎構造の信頼性解析 Invited

第18回土木鋼構造研究シンポジウム一般財団法人日本鉄鋼連盟　2014/11/22
「地盤工学における信頼性解析」（下記の6講演を1日かけて実施） 1）提案する信頼性解析法の概要，2）地盤パラメータの空間的バラツキの取扱，3）統計的推定誤差，4）変換誤差とモデル化誤差，5）ETC10例題，6）地盤構造物設計の課題 Invited

沿岸技術研究センター（国土交通省国土技術政策総合研究所）講習会　2014/07/28
地盤調査から設計計算までを対象とした信頼性解析体系-地盤の不均質性評価を中心として Invited

C105国内委員会（Geo-Mechanics from Micro to Macro)，地盤工学会　2014/03/30
目視点検データの統計解析に基づく健全度評価と劣化予測モデル Invited

株式会社建設技術研究所技術講習会　2013/07/12
地盤構造物の信頼性設計施工専門委員会特別講演 Invited

一般財団法人鋼管杭・鋼矢板技術協会　2012/11/22
信頼性解析法の河川堤防への適用-問題点の整理 Invited

堤防委員会招待講演一般財団法人国土技術研究センター　2012/11/05
信頼性設計の基礎理論と実際（その3） Invited

鉄道総合技術研究所セミナー
「信頼性設計の基礎理論と実際（その2） Invited

鉄道総合技術研究所セミナー
信頼性設計の基礎理論と実際（その1） Invited

鉄道総合技術研究所セミナー
地質・地形・地盤調査法 Invited

令和5年度国土交通大学校道路構造物〔基礎〕研修
河川堤防のリスク評価における課題と今後の展望：国際的な事例からの学び Invited

令和5年度第1回リスクマネジメントセミナー特別講演（東京都市大学）
データ駆動型の信頼性設計法：数値解析を活用した多様性のある設計・制御へ向けて Invited

Soil Plusセミナー2022
地質・地形・地盤調査法 Invited

令和4年度国土交通大学校道路構造物〔基礎〕研修
パネルディスカッション：JIS A3305から見た国内構造基準の課題と荷重規定：地盤設計分野課題とJIS A3305活用の可能性 Invited

建築学会大会2022（北海道大学）
地盤構造物のデータ駆動型性能設計：めったにおきないことをどのように予測するのか Invited

京都大学大学院特別講義
パネルディスカッション：目的設定をいかにかんがえるか？ Invited

2021関東地区・応用力学フォーマル〜V&Vと性能設計の接点〜
地質・地形・地盤調査法 Invited

大竹雄

令和3年度国土交通大学校道路構造物〔基礎〕研修
データ駆動型のレジリエンス性能評価法の開発 Invited

大竹雄

インサイト・データサイエンスカンファレンス
Reliability-based design in code development and application Invited

Geo-Risk 2023

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Research Projects 42

インフラ点検新技術の最適実装施策と実装可能精度評価に関する研究

水谷大二郎, 大竹雄

Offer Organization: 日本学術振興会

System: 科学研究費助成事業

Category: 基盤研究(B)

Institution: 東北大学

2024/04/01 - 2028/03/31
流域治水を志向した河川堤防システム性能評価手法の確立

肥後陽介, 音田慎一郎, 大竹雄, 高野大樹

Offer Organization: 日本学術振興会

System: 科学研究費助成事業

Category: 基盤研究(A)

Institution: 京都大学

2023/04/01 - 2027/03/31
Locally Structured Unitary Networks and Tangent Space Learning for Dynamic Systems Modeling

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (A)

Institution: Niigata University

2022/04/01 - 2026/03/31
Challenges to Failure Scenario Guided Design of Geotechnical Structures

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (B)

Institution: Tohoku University

2022/04/01 - 2025/03/31
地盤構造物の破壊シナリオ誘導型設計への挑戦

大竹雄, 肥後陽介, 糸井達哉, 吉田郁政

Offer Organization: 日本学術振興会

System: 科学研究費助成事業

Category: 基盤研究(B)

Institution: 東北大学

2022/04/01 - 2025/03/31
International collaboration to establish new framework of soil mechanics enhanced by granular mechanics

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Fund for the Promotion of Joint International Research (Fostering Joint International Research (B))

Institution: University of Tsukuba

2021/10/07 - 2025/03/31
自然法則に基づく安定性河道とデータ駆動型の河道の予知保全法による河川の多重性向上

安田浩保

Offer Organization: 日本学術振興会

System: 科学研究費助成事業基盤研究(A)

Category: 基盤研究(A)

Institution: 新潟大学

2021/04 - 2025/03

More details Close

扇状地前後に位置する河川では、底面に交互砂州と呼ばれる起伏形状が自発的かつ例外なく形成される。交互砂州が発達した河川における平水時の澪筋は、導波管現象のように両岸の間を対角線状に反射する形状となる。本研究では、まず、交互砂州が発達する河川における普遍的な幾何学的形状の探索を行い、その中で自発的に形成される澪筋が形状安定性に優れることに着目し、その形状を定量化した。次に、実河川で見られた自発的澪筋の川幅を初期に与える模型実験と実河川のそれぞれでを行い、その形状安定性は非常に優れることを実証した。また、初期の底面を平坦とし、そこから交互砂州が徐々に形成される過程について高い空間分解能かつ高頻度に測定した。これは、交互砂州の形成の端緒の測定の初めての成功と言え、今後、交互砂州の形成の機構解明とそれに基づく制御への応用が期待できる。ただし、2021年度の研究において、移動床水理の時間発展のアンサンブル計算を行ったところ、移動床水理にはカオス性を内在する結果が得られた。 <BR> 本研究では、本研究グループが独自に開発したStream Tomography: STという模型実験における移動床水理の高い空間分解能かつ高頻度な測定法の拡張を行った。具体的には、STにより高い分解能かつ高頻度に取得される水面と底面の観測ビッグデータの数理的な処理により、流れの支配方程式を用いず、これらの測定値と同等の空間分解能で流速の推定を可能とした。上記の通り、移動床水理はカオス性を内在する結果が得られ、モデル駆動型解析による長期予測は得策ではないことが示唆された。拡張されたSTにより得られる観測ビッグデータのデータ駆動型解析によりモデル駆動型解析の代替えや補強が可能となる結果も得つつある。具体的には、STの観測ビッグデータを特異値分解することで、河川の物理的な状態を把握できる可能性があることがわかってきた。
確率的な手法を用いた効率的な維持管理に関する研究

Offer Organization: 一般財団法人港湾航空総合技術センター（SCOPE）

Category: 共同研究

2021/06 - 2023/03
Development of flood monitoring system using microwave radar with data driven signal processing

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Challenging Research (Pioneering)

Category: Grant-in-Aid for Challenging Research (Pioneering)

Institution: Niigata University

2020/07 - 2023/03
An interdisciplinary stochastic tsunami disaster prediction accelerated by a surrogate model

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)

Category: Grant-in-Aid for Scientific Research (B)

Institution: Kyushu University

2020/04 - 2023/03
偶発的マルチハザードに対する河川堤防のロバスト性評価の実現

肥後陽介, 音田慎一郎, 高野大樹, 大竹雄

Offer Organization: 日本学術振興会

System: 科学研究費助成事業基盤研究(A)

Category: 基盤研究(A)

Institution: 京都大学

2020/04 - 2023/03
土のミクロスケール多相系組織形態変化のモデル化－地盤変形予測技術の再構築へ

肥後陽介, 松島亘志, 大竹雄

Offer Organization: 日本学術振興会

System: 科学研究費助成事業挑戦的研究(開拓)

Category: 挑戦的研究(開拓)

Institution: 京都大学

2019/06 - 2023/03

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前年度までに明らかにした，ミクロスケールの多相系組織形態変化に基づき，メソ～マクロの土の挙動を基本的な土質力学の物理量を用いて記述するマイクロメカニクスベースモデルを構築した．土相のみの粒状体マイクロメカニクスベース構成式を定式化し，特に土の限界状態を表現するための拡張を実施した．次に，不飽和土のサクションの影響を考慮し，前年度までに開発した液架橋の影響のモデルに加え，バルク水の影響をモデル化し，定性的なモデルのパフォーマンスを確認した．さらに，微視的な不飽和土の保水性試験の観察結果から，微視的な観点から水分特性曲線をモデル化した．規則充填モデルを構築し，等球径ランダム充填の密度分布を導入することで土粒子構造の密度不均一性を表現した．等球径ランダム充填と菱面体構造の密度の範囲に着目し，分布の適用範囲についても考察した．構築したモデルを用いて，土粒子構造の不均一性を仮定した場合と均一な構造を仮定した場合のSWCCを比較した結果，不均一性を仮定した場合の方がSWCCの比水分容量が小さくなることが分かった．また，土粒子構造の不均一性がSWCCに与える影響は単粒径の供試体ほど小さく，不均一性の有無よりも粒度分布の差異の方がSWCCに顕著な影響を及ぼすことが示唆された． DEMシミュレーションを実施し，解析的に多相系組織形態変化を解釈することを試みた．まず土相だけの力学挙動をシミュレーションし，多相解析への拡張の準備を終えた．次に既往の実験結果を改めて観察し，土粒子の接触点及び間隙にどのように間隙水が付着しているのかを詳細に観察し，多相解析への拡張の際にモデル化に必要な物理現象を明らかにすることを試みた．
地盤改良の施工及び地盤情報の活用に関する研究

Offer Organization: 株式会社不動テトラ

System: 共同研究

2020/10 - 2022/10
越流侵食に対する河川堤防のロバスト設計に関する技術研究開発

肥後陽介, 高野大樹, 大竹雄

Offer Organization: 京都大学大学院，港湾空港技術研究所，株式会社日建設計シビル

2021/06 -
土木構造物の施工・点検に伴う観測データを活用したデータ解析

Offer Organization: 株式会社水倉組

2021/04 -
Data-driven Active River Channel Control for Maintenance and Recovery of Stream Integrity

Muramatsu Shogo

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Challenging Research (Exploratory)

Category: Challenging Research (Exploratory)

Institution: Niigata University

2019/06 - 2021/03

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In this study, we proposed a river channel active control method to maintain and restore river channel integrity. A cyber-physical system (CPS) for controlling river channel dynamics is proposed, and a data-driven algorithm for deriving the time evolution equation of river bed movement and estimating the channel dynamics is developed as a useful technique for the CPS construction. We also proposed a method for predicting the water level distribution in the whole river system. A prototype CPS was constructed to control the optimal placement of groynes to maintain a healthy channel, and a series of processes from sensing to actuation was realized. We made 7 presentations at domestic conferences and 2 presentations at international conferences as research results.
An example of Specific V&V for slope disaster simulations

Moriguchi Shuji

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)

Category: Grant-in-Aid for Scientific Research (B)

Institution: Tohoku University

2018/04 - 2021/03

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It’s generally difficult to discuss the accuracy and reliability in disaster simulations. On the other hand, recently, V&V (Verification & Validation) of numerical simulations has been emphasized and widely discussed. The purpose of this study is to develop the information that are necessary for V&V of rockfall analysis and sediment flow analysis using the discrete element method (DEM). Specifically, information on the following three topics was studied based on the results of DEM analysis: setting up benchmark problems, quantification of the effect of uncertainties in DEM simulations, and frameworks for reducing computational cost.
Development of Performance Evaluation Method for Geotechnical Structures under Construction and in Service

Yu Otake

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)

Category: Grant-in-Aid for Scientific Research (B)

2018/04 - 2021/03

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(1) Survey of the actual situation and collection of information in Europe and the U.S.: We collected design standards and a wide range of standards related to risk assessment and existing studies on information updating using Bayesian modeling. (2) Development of performance evaluation methods for individual facilities (detailed method) and for groups of facilities (simplified method): For the detailed method, a data analysis method for multidimensional information was developed. For the detailed method, we developed a method for analyzing multidimensional data (including missing data). We developed a spatial distribution modeling method that can take into account the interrelationship of information at various survey intervals and with different observation accuracy, such as information at the time of construction. (3) Implementation of case studies using actual data: Case studies based on the collection and organization of actual data were conducted for three cases.
Development of robustness evaluation method for river levees against floods and earthquakes for performance-based design

Higo Yosuke

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A)

Category: Grant-in-Aid for Scientific Research (A)

Institution: Kyoto University

2017/04 - 2021/03

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Great earthquakes and floods caused by torrential rains, which have become increasingly severe in recent years, require the performance of river levees in Japan to allow deformation but not entire collapse. This so-called "robustness" in the framework of performance-based design, and is regarded as a principle performance requirement to ensure the safety of structures. In this study, we developed an analysis method that can predict the progressive deformation and collapse process (robustness) of river levees due to seismic motion, overflow and seepage flow. We also proposed a method to quantify the prediction accuracy of the proposed method through V&V (verification and validation). These results lead to the evaluation of the robustness of river embankments against floods and earthquakes.
信頼性解析に基づく鋼管杭の性能評価

Offer Organization: 鉄鋼連盟鋼構造研究・教育助成事業

2020/04 -
地盤調査法と高度化等を考慮した道路橋基礎の部分係数設計法に関する研究

Offer Organization: 土木研究所構造物メンテナンス研究センター共同研究

2017 - 2019
River dike reliability analysis considering natural hazards based on a unified evaluation theory

Otake Yu

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (B)

Category: Grant-in-Aid for Young Scientists (B)

Institution: Niigata University

2015/04 - 2018/03

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The authors has developed the reliability analysis method considering some kinds of natural hazard to evaluate the safety of river dike properly in Japan. The basic theory has been presented based on investigation that the researches in the Netherland where reliability analysis method has been progressed for river dike.Furthermore, the idea implemented to the data of an actual 35km stretch of a fairly large river running through one of the major cities in Japan.
回転杭の実用的かつ具体的な信頼性解析法の開発と提示

Offer Organization: 鉄鋼連盟鋼構造目的研究

2017 - 2018
劣化要因の空間分布を考慮した確率論的予測と観測の最適化に関する研究

Offer Organization: 一般財団法人港湾航空総合技術センター（SCOPE），共同研究

2017 - 2018
ハザード解析と堤防信頼性解析を融合した洪水リスク解析法の開発

Offer Organization: 国土技術研究センター第15回研究開発助成

2017 - 2018
橋梁床版コンクリートの骨材分布調査・解析

Offer Organization: 株式会社ネクスコ・エンジニアリング新潟共同研究

2016 - 2018
パイピングに伴う堤防劣化を考慮した河川堤防評価技術の開発

小高猛司

Institution: 河川砂防技術研究開発公募・河川技術分野

2015 - 2017
新潟県を対象とした高速道路リスク評価導入に関する研究

Offer Organization: 東日本高速道路株式会社共同研究

2017 -
杭基礎の水平載荷試験を対象とした信頼性解析手法による検討

Offer Organization: 公益社団法人鉄道総合研究所受託研究

2017 -
パイピング・盤ぶくれを考慮した河川堤防の総合的な信頼性解析の開発

Offer Organization: 国土技術研究センター

System: 第15回研究開発助成

2015 - 2016
確率統計手法による効率的な維持管理に関する研究

Offer Organization: 一般財団法人港湾航空総合技術センター（SCOPE）共同研究

2015 - 2016
施工時情報を用いた鋼管杭の性能評価とその実装

Offer Organization: 鉄鋼連盟鋼構造目的研究

2016 -
基礎の載荷試験を対象とした信頼性解析

Offer Organization: 公益社団法人鉄道総合研究所受託

2016 -
Development of a geotechnical reliability analysis by a simplified procedure and optimization of soil investigations

HONJO Yusuke, OTAKE Yu

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)

Category: Grant-in-Aid for Scientific Research (B)

Institution: Gifu University

2012/04 - 2015/03

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The reliability analyses (RA) have been popularized through development of design codes throughout the world in the past several decades. However, issues related to the geotechnical reliability analyses have been identified in the same period because RA had been developed mainly in the structural engineering. This study is solving these issues, namely by developing methods (1) to determine the characteristic values of soil parameters based on the soil investigation at a site by statistically sound foundation, (2) to evaluate the impact of soil spatial variability on performances of a geotechnical structure, and (3) to propose a method to combine complex geotechnical calculation tools and RA tools etc. Finally, these parts are systematically synthesized to make a geotechnical reliability analysis by a simplified procedure (GRASP).
回転杭の実用的かつ具体的な信頼性解析法の開発と提示

Offer Organization: 鉄鋼連盟鋼構造目的研究

2014 - 2015
地震・洪水およびその複合災害に対する統合型河川堤防評価技術の開発

小高猛司

Institution: 河川砂防技術研究開発公募・河川技術分野

2012 - 2014
道路橋示方書の改定を踏まえた性能設計概念に基づく設計照査手法についての研究開発 - 特に下部構造を中心として -

Offer Organization: 国土交通省道路局

System: 新道路技術会議（国交省新道路）

2012 - 2014
空間統計学を利用した港湾コンクリート構造物の効率的な維持管理に関する研究

Offer Organization: 一般財団法人港湾航空総合技術センター（SCOPE）共同研究

2014 -
信頼性解析に基づく鋼管杭の性能評価：回転杭の性能評価を中心として

Offer Organization: 鉄鋼連盟

System: 鋼構造研究・教育助成事業

2013 -
信頼性解析に基づく鋼管杭の性能評価

Offer Organization: 鉄鋼連盟

System: 鋼構造研究・教育助成事業

2012 -
地盤調査地点を考慮した河川堤防の液状化危険度評価に関する研究

Offer Organization: 国土技術研究センター

System: 第13回研究開発助成

2012 -
橋梁構造物の計画的かつ効果的な維持管理に向けた橋梁点検データの統計分析

Offer Organization: 鉄鋼連盟

System: 鋼構造研究・教育助成事業

2011 -

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Teaching Experience 34

情報とデータの基礎　東北大学
情報処理演習　東北大学
スペクトル解析　東北大学大学
建築・社会環境工学演習　東北大学
情報基礎B　東北大学
地盤工学III　新潟大学
社会基盤設計基礎　新潟大学
水理学実験　新潟大学
リメディアル演習　新潟大学
総合技術科学演習　新潟大学
工学リテラシー入門（力学分野）　新潟大学
工学リテラシー入門（建設学科）　新潟大学
卒業研究又は設計　新潟大学
卒業研修又は基礎設計　新潟大学
地盤工学基礎　新潟大学
社会基盤プロジェクト・マネージメント　新潟大学
社会基盤工学概論　新潟大学
技術英語II　新潟大学
地盤工学II　新潟大学
地盤工学実験　新潟大学
社会基盤基礎設計　新潟大学
地盤工学I　新潟大学
技術英語入門　新潟大学
くらしと環境　新潟大学
地盤防災論　新潟大学
環境地盤学特論　新潟大学
測量学実習　新潟大学
環境科学総合演習Ⅲ　新潟大学
環境科学セミナーⅢ　新潟大学
都市人間環境学Ⅰ　新潟大学
研究発表演習Ⅲ（学外発表）　新潟大学
研究発表演習Ⅲ（中間発表）　新潟大学
環境科学特定演習Ⅲ　新潟大学
環境科学特定研究Ⅲ　新潟大学

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