Updated on 2026/04/29

写真a

 
KOCHI TAISHI
 
Organization
School of Environment and Society Assistant Professor
Title
Assistant Professor
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Research Interests

  • peat

  • thermo-mechanical behaviour

  • 長期沈下

  • 粘塑性構成則

  • 有限要素解析

Research Areas

  • Social Infrastructure (Civil Engineering, Architecture, Disaster Prevention) / Geotechnical engineering

Education

  • Hokkaido University   Graduate School of Engineering   Division of Field Engineering for Environment

    2023.4 - 2026.3

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    Country： Japan

    Notes： Soil mechanics laboratory

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  • Hokkaido University   Graduate School of Engineering   Division of Field Engineering for Environment

    2021.4 - 2023.3

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  • University of Alaska, Fairbanks   Department of civil engineering   Student exchange program

    2022.8 - 2022.12

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    Country： United States

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  • Hokkaido University   School of Engineering   Department of Socio-Environmental Engineering

    2017.4 - 2021.3

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    Country： Japan

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Research History

  • Institute of Science Tokyo   Assistant Professor

    2026.4

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Papers

  • Temperature dependency of secondary consolidation in peats Reviewed

    Kochi Taishi, Satoshi Nishimura

    Proceedings of the 20th International Conference on Soil Mechanics and Geotechnical Engineering (ICSMGE 2026)   2026.6

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    Authorship：Lead author  

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  • Long-term settlement behavior of peat after unloading and applicability of isotach law Reviewed

    Nobutaka Yamazoe, Satoshi Nishimura, Hiroyuki Tanaka, Toshihiro Ogino, Taishi Kochi

    Soils and Foundations   2025.1

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  • Thermo-mechanical behaviour of peats under 1D compression Reviewed

    Taishi Kochi, Satoshi Nishimura, Nobutaka Yamazoe

    Géotechnique   2024.12

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    Authorship：Lead author   Publishing type：Research paper (scientific journal)  

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  • An interpretation of thermo-mechanical behaviour of peat under 1-D compression Reviewed

    Taishi Kochi, Satoshi Nishimura, Nobutaka Yamazoe

    E3S Web of Conferences   544   12001 - 12001   2023.9

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    Authorship：Lead author   Publishing type：Research paper (international conference proceedings)   Publisher：EDP Sciences  

    The one-dimensional thermo-mechanical behaviour of two peats was investigated through consolidation tests, including incremental loadings and constant-rate-of-strain loadings, under a variety of temperature-stress conditions. As an appropriate expression of highly compressible materials, the natural strain was employed instead of conventional engineering strain, which eliminates the apparent stress dependency of the compression index and the coefficient of secondary compression. Test results suggest the applicability of an isotach approach to the two peats used in this study. The temperature dependency of the coefficient of secondary compression defined with natural strain, λ*α, is very small. All the results summarized on the effective stress-strain plane show that there exists a unique Normal Compression Line (NCL) corresponding to each combination of temperature and strain rate. The NCLs are parallel to each other. Finally, in an attempt to construct a constitutive model, the temperature dependency of the NCL was quantified by introducing a constant, λ*T. By using the two parameters, λ*α and λ*T, which describe the strain rate- and temperature-dependent characteristics, respectively, a 1-D thermo-mechanical behaviour observed in this study will be modelled in a simple manner.

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Presentations

  • Thermo-mechanical behaviour of peats under 1-D compression

    Taishi Kochi

    1st India-Japan-Korea Trilateral Joint Geotechnical Workshop  2024.5 

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  • An interpretation of thermo-mechanical behaviour of peat under 1-D compression.

    Taishi Kochi

    8th International Symposium on Deformation Characteristics of Geomaterials  2023.9 

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    Language：English  

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Awards

  • Geotechnical Research Medal 2026

    2026.3   Institution of Civil Engineers (ICE)   Thermo-mechanical behaviour of peats under 1-D compression

    Taishi Kochi, Satoshi Nishimura, Nobutaka Yamazoe

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  • Best presenter award

    2024.9   Japanese geotechnical society  

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  • Excellence in Student Achievement Award

    2023.2   Division of Field Engineering for Environment, Graduate School of Engineering, Hokkaido university  

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  • Best presenter award

    2022.9   Japanese geotechnical society  

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  • Branch award (Student)

    2022.2   Japanese geotechnical society, Hokkaido branch  

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Research Projects

  • 高有機質地盤の長期沈下：熱・水・土連成問題としての新解釈

    2025.4 - 2027.3

    日本学術振興会  科学研究費助成事業 

    河内 太志

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    Authorship：Principal investigator 

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  • エネルギーインフラ利用時の泥炭地盤挙動の予測技術発展

    Grant number：PK25240060  2024.8 - 2025.7

    北海道ガス大学研究支援制度 

    河内 太志

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    Authorship：Principal investigator 

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