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Integration of structure-fluid-fluxcodel for subsurface geo enginnering

Research Project

Project/Area Number 19K15094
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 22030:Geotechnical engineering-related
Research InstitutionTokyo University of Marine Science and Technology (2021)
Japan Agency for Marine-Earth Science and Technology (2019-2020)

Principal Investigator

Nomura Shun  東京海洋大学, 学術研究院, 准教授 (20705701)

Project Period (FY) 2019-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
Fiscal Year 2021: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2020: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2019: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Keywords海洋地盤 / 数値解析 / 室内試験 / 混合体材料 / 地盤工学 / 連成解析 / 深海底地盤 / 熱・フラックス輸送 / 海底表層地盤 / 有限要素法
Outline of Research at the Start

①地盤骨格の変形安定,②流体浸透-物質輸送,③熱輸送-化学状態変化等の理論統合に向け,実験・解析事実を蓄積し,海底資源開発やインフラ整備へと技術を援用するための基礎理論の構築を行う.地盤内に種々の要因が計測可能な計測機器を埋め込んだシステムを構築し,地盤骨格,間隙流体の時空間変化を計測する.得られた実験結果をもとに既存の地盤変形解析コードを高度化し,深海底地盤で生じる物理現象の表現性能の評価を行う.

Outline of Final Research Achievements

The seafloor ground always exists at the boundary between the seafloor and the crust, and the occupancy rate is not large on a global scale. However, it is an area where various physicochemical phenomena are observed as well other global boundaries. To elucidate the earth dynamics and promote understanding the area where great expectations are placed on its industrial use, the "soil -fluid-thermochemical coupling model" that can evaluate the spatio-temporal ground condition accompanied by special environmental changes has been developed.
In the research process, I mainly tackled on (1) the deformation stability problem on the ground, (2) the fluid infiltration and material transport problem, and (3) the theoretical integration of the developed theory with the heat transportation process.

Academic Significance and Societal Importance of the Research Achievements

海底地盤の力学現象を把握するには土/水/空気で構成される多相混合体である地盤の力学体系を正記す必要がある。また,地盤中の熱や溶解物質が地盤内を運動する際,温度,圧力,濃度といった逐次変化する環境因子の中でそれらがどのように領域に伝播し波及していくか理論的に説明する必要がある。本研究では主に数理理論の構築に主眼を置き、質量保存則,混合体理論といった物理法則の根幹となる理論から理論体系の整理を行った。
併せて、海洋構造物と地盤材料の境界における相互作用の理解を進めるための観察手法の構築が進み要素情報計測のための基盤技術が整った。

Report

(4 results)
  • 2021 Annual Research Report   Final Research Report ( PDF )
  • 2020 Research-status Report
  • 2019 Research-status Report
  • Research Products

    (7 results)

All 2022 2021 2020 2019

All Journal Article (4 results) (of which Int'l Joint Research: 3 results,  Peer Reviewed: 4 results,  Open Access: 2 results) Presentation (3 results) (of which Int'l Joint Research: 1 results)

  • [Journal Article] Spatio-temporal deposition profile of an experimentally produced turbidity current with a continuous suspension supply2022

    • Author(s)
      Nomura Shun、De Cesare Giovanni、Furuichi Mikito、Takeda Yasushi、Sakaguchi Hide
    • Journal Title

      International Journal of Sediment Research

      Volume: 37 Issue: 3 Pages: 299-306

    • DOI

      10.1016/j.ijsrc.2021.11.004

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Measurement of the inner structure of turbidity currents by ultrasound velocity profiling2021

    • Author(s)
      Hitomi Jumpei、Nomura Shun、Murai Yuichi、De Cesare Giovanni、Tasaka Yuji、Takeda Yasushi、Park Hyun Jin、Sakaguchi Hide
    • Journal Title

      International Journal of Multiphase Flow

      Volume: 136 Pages: 103540-103540

    • DOI

      10.1016/j.ijmultiphaseflow.2020.103540

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Quasi-stationary flow structure in turbidity currents2020

    • Author(s)
      Nomura Shun、De Cesare Giovanni、Furuichi Mikito、Takeda Yasushi、Sakaguchi Hide
    • Journal Title

      International Journal of Sediment Research

      Volume: 35 Issue: 6 Pages: 659-665

    • DOI

      10.1016/j.ijsrc.2020.04.003

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Extension of unsaturated soil mechanics and its applications2019

    • Author(s)
      Iizuka Atsushi、Tachibana Shinya、Takeyama Tomohide、Sugiyama Yuri、Nomura Shun、Ohta Hideki
    • Journal Title

      Geotechnical Research

      Volume: 6 Issue: 3 Pages: 156-176

    • DOI

      10.1680/jgere.18.00004

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] 音響層別流速計(ADCP)長期観測データの復旧と解析2020

    • Author(s)
      岩瀬良一,野村瞬
    • Organizer
      第41 回超音波エレクトロニクスの基礎と応用に関するシンポジウム
    • Related Report
      2020 Research-status Report
  • [Presentation] 179th Meeting of the Acoustical Society of America2020

    • Author(s)
      Ryoichi Iwase, Shun Nomura
    • Organizer
      Long-lasting acoustic resonant signal associated with the turbidity current triggered by the 2003 Tokachi-oki earthquake
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research
  • [Presentation] 有限要素法によるコーン貫入の数値解析2020

    • Author(s)
      野村瞬, 笠谷貴史,阪口秀
    • Organizer
      第55回地盤工学研究発表会
    • Related Report
      2020 Research-status Report

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Published: 2019-04-18   Modified: 2023-01-30  

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