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Study on heat-water-stress coupled model of soils considering hysteresis of unfrozen water due to freezing and thawing

Research Project

Project/Area Number 20K04681
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 22030:Geotechnical engineering-related
Research InstitutionResearch Institute of Shimizu Construction Co. (2021-2022)
Nagaoka University of Technology (2020)

Principal Investigator

Chen Jian  清水建設株式会社技術研究所, その他部局等, 研究員 (30556668)

Co-Investigator(Kenkyū-buntansha) 杉本 光隆  長岡技術科学大学, 工学研究科, 教授 (50196755)
豊田 浩史  長岡技術科学大学, 工学研究科, 教授 (90272864)
Project Period (FY) 2020-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2022: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2021: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2020: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Keywords連成解析 / 土壌凍結特性曲線 / 水遷移 / パラメータ同定 / 不凍水分量 / ワイブル分布 / 圧力溶解 / 潜熱効果 / 凍結特性曲線 / 凍土造成 / 不飽和透水係数 / 熱伝導 / 凍土 / 不凍水量
Outline of Research at the Start

本研究は,核磁気共鳴実験で明らかになってきた土中の氷と水の相転移特性を,水分質量保存則のシンク(Sink)とソース(Source)項に付与し,凍結融解に伴う土の強度・剛性の変化や不凍水量のヒステリシスを記述できる構成式を導入し,凍結融解作用を受ける地盤の変位挙動をより正確に予測する手法を開発することが主な特徴である。
本研究により,寒冷地にある自然斜面や人工斜面の融雪期の地すべり危険度の評価,災害予測,また,地盤凍結工法において解凍沈下による近接インフラ構造物への影響評価が可能となる。

Outline of Final Research Achievements

The hysteresis phenomenon of the unfrozen water content occurs because the ice content and hydraulic conductivity change greatly due to the freezing-thawing process of soils. It is necessary to develop a heat-water-stress coupled analysis model that can consider such a complicated moisture history.
Based on the porous media theory, this study considers the phase transition characteristics of ice and water in soils, which have been clarified by nuclear magnetic resonance experiments. The phase transition characteristics were represented as soil freezing characteristic curve into the proposed model. A more versatile heat-water-stress coupled model was constructed.In addition, soil column freezing experiments with and without water supplying were conducted. The experimental and the simulated results of temperature, water content, and frost heave were compared to verify the proposed model. The effects of moisture, heat transfer and deformation properties during freezing were clarified.

Academic Significance and Societal Importance of the Research Achievements

本研究では,複雑な水分履歴を考慮できる熱-水-応力連成解析モデルの構築と検証を目的として,主に理論モデルの定式化,土のカラム凍結実験および連成解析結果の検証,を実施した.
本研究結果は,より実現象を反映する連成モデルの構築を実現するもので,自然地盤の凍上や人工凍結工法による地盤変形に関する予測精度の向上,ひいては,地盤災害の軽減に寄与すると考えられる.

Report

(4 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • 2020 Research-status Report
  • Research Products

    (8 results)

All 2023 2022 2021 2020

All Journal Article (5 results) (of which Int'l Joint Research: 5 results,  Peer Reviewed: 5 results) Presentation (3 results)

  • [Journal Article] Analytical solution for the steady-state temperature field of a linear three-pipe freezing system under hydrodynamic conditions2023

    • Author(s)
      Li Zhiming、Tang Aiping、Chen Jian、Zhou Yundong
    • Journal Title

      International Journal of Thermal Sciences

      Volume: 191 Pages: 108378-108378

    • DOI

      10.1016/j.ijthermalsci.2023.108378

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Modified Statistical Damage Constitutive Model for Frozen Sand Based on Nonlinear Strength Criterion2022

    • Author(s)
      Li Zhiming、Zhou Yundong、Chen Jian、Sugimoto Mitsutaka
    • Journal Title

      KSCE Journal of Civil Engineering

      Volume: 26 Issue: 11 Pages: 4467-4477

    • DOI

      10.1007/s12205-022-2096-8

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] A novel model of heat-water-air-stress coupling in unsaturated frozen soil2021

    • Author(s)
      Li Zhiming、Chen Jian、Tang Aiping、Sugimoto Mitsutaka
    • Journal Title

      International Journal of Heat and Mass Transfer

      Volume: 175 Pages: 121375-121375

    • DOI

      10.1016/j.ijheatmasstransfer.2021.121375

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Thermal Behavior in Cross-Passage Construction during Artificial Ground Freezing: Case of Harbin Metro Line2020

    • Author(s)
      Li Zhiming、Chen Jian、Sugimoto Mitsutaka、Mao Chaojun
    • Journal Title

      Journal of Cold Regions Engineering

      Volume: 34 Issue: 3

    • DOI

      10.1061/(asce)cr.1943-5495.0000221

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Pulsed NMR Measurements of Unfrozen Water Content in Partially Frozen Soil2020

    • Author(s)
      Li Zhiming、Chen Jian、Sugimoto Mitsutaka
    • Journal Title

      Journal of Cold Regions Engineering

      Volume: 34 Issue: 3

    • DOI

      10.1061/(asce)cr.1943-5495.0000220

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] COUPLED THERMAL- HYDRO ANALYSIS FOR UNSATURATED FROZEN SOILS2022

    • Author(s)
      陳 剣、杉本 光隆
    • Organizer
      JSCE 令和4年度土木学会全国大会第77回年次学術講演会
    • Related Report
      2022 Annual Research Report
  • [Presentation] Coupled Thermal-Hydro Analysis for Unsaturated Frozen Soils2022

    • Author(s)
      Jian Chen, Mitsutaka Sugimoto
    • Organizer
      土木学会年次講演会
    • Related Report
      2021 Research-status Report
  • [Presentation] パルス核磁気共鳴法(P-NMR)を用いた凍結融解時における土壌の不凍水分量測定2020

    • Author(s)
      森山哲成、陳剣、杉本光隆
    • Organizer
      第38回 土木学会関東支部新潟会研究調査発表会
    • Related Report
      2020 Research-status Report

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Published: 2020-04-28   Modified: 2024-01-30  

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