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The construction of mechanical theory of expansive soils based on the chemical surface phenomena of mineral crystals - Reconsideration of problem soils in geotechnical engineering -

Research Project

Project/Area Number 18K13824
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 22030:Geotechnical engineering-related
Research InstitutionThe University of Tokyo

Principal Investigator

Kyokawa Hiroyuki  東京大学, 大学院工学系研究科(工学部), 助教 (60799865)

Project Period (FY) 2018-04-01 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2019: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2018: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
Keywords膨潤性粘土 / ベントナイト / 構成式 / 水理-力学-化学連成 / 数値解析 / 浸透圧密 / 浸透膨潤 / 力学-化学連成 / 化学-力学連成 / せん断 / 土の化学的性質 / 表面化学 / 要素試験
Outline of Final Research Achievements

A novel mechano-chemical (MC) constitutive model for expansive soils based on the chemical surface phenomena of mineral crystals, which the representative and intrinsic characteristic of them, was proposed in this research. Comparing with the experiment results, the proposed MC model could properly describe the deformation characteristics of expansive soil (bentonite) depending on the content of expansive clay mineral and its properties, and the electrolyte solution. Moreover, by the finite element analysis implementing the proposed MC model, the osmotic consolidation behavior of expansive soils were theoretically explained as the hydro-mechano-chemical coupling phenomena.

Academic Significance and Societal Importance of the Research Achievements

ベントナイトに代表される膨潤性粘土(鉱物)は,国内や世界中に広く分布しているにも関わらず,地盤工学的には設計法や評価法のない特殊土として扱われている.本研究では,それら膨潤性粘土の特徴を支配する構成粘土鉱物(スメクタイト)の表面化学現象に着目した新しい構成モデルを開発した.提案モデルは,膨潤性粘土鉱物の含有量や物性,水質環境の違いによる力学特性を適切に評価でき,有限要素法による数値解析コードに実装されている.今後,廃棄物処分施設の緩衝材の候補となっているベントナイトに限らず,自然地盤において膨潤性鉱物を含む各種地域土についても,その力学的挙動の評価が可能になる.

Report

(3 results)
  • 2019 Annual Research Report   Final Research Report ( PDF )
  • 2018 Research-status Report
  • Research Products

    (10 results)

All 2021 2020 2019 2018 Other

All Journal Article (1 results) (of which Peer Reviewed: 1 results) Presentation (7 results) (of which Int'l Joint Research: 3 results) Remarks (2 results)

  • [Journal Article] A method for extending a general constitutive model to consider the electro‐chemo‐mechanical phenomena of mineral crystals in expansive soils2020

    • Author(s)
      Kyokawa, H., Ohno, S. and Kobayashi, I.
    • Journal Title

      International Journal for Numerical and Analytical Methods in Geomechanics

      Volume: 44(6) Issue: 6 Pages: 749-771

    • DOI

      10.1002/nag.3026

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [Presentation] Constitutive model describing the hydro-mechanical behaviors of compacted bentonite clay based on the crystal surface phenomena2021

    • Author(s)
      Kyokawa, H.
    • Organizer
      2ND INTERNATIONAL CONFERENCE ON ENERGY GEOTECHNICS
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 膨潤土の水理-力学-化学連成挙動のモデル化手法2020

    • Author(s)
      京川裕之
    • Organizer
      第55回地盤工学研究発表会
    • Related Report
      2019 Annual Research Report
  • [Presentation] 膨潤性粘土の浸透圧密現象の局所挙動とその時間的発展に関する実験的検討2020

    • Author(s)
      平賀美沙,京川裕之,古関潤一
    • Organizer
      第55回地盤工学研究発表会
    • Related Report
      2019 Annual Research Report
  • [Presentation] 膨潤性粘土の強度特性におよぼす陽イオン濃度の影響のモデル化2020

    • Author(s)
      依田光平,京川裕之,古関潤一
    • Organizer
      第55回地盤工学研究発表会
    • Related Report
      2019 Annual Research Report
  • [Presentation] Experimental and analytical investigations of volume change behaviour of saturated expansive soils in oedometer test2019

    • Author(s)
      Hiraga, M., Kyokawa, H. and Koseki, J.
    • Organizer
      7th International Symposium on Deformation Characteristics of Geomaterials
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] A method to consider the electrical/chemical interaction of clay crystal in general constitutive model2018

    • Author(s)
      Hiroyuki Kyokawa
    • Organizer
      Numerical Methods in Geotechnical Engineering IX
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] 膨潤性粘土の力学-化学連成手法2018

    • Author(s)
      京川裕之
    • Organizer
      第53回地盤工学研究発表会
    • Related Report
      2018 Research-status Report
  • [Remarks]

    • URL

      http://geotle.t.u-tokyo.ac.jp/hiroyuki-kyokawa/

    • Related Report
      2019 Annual Research Report
  • [Remarks]

    • URL

      http://geotle.t.u-tokyo.ac.jp/hiroyuki-kyokawa/

    • Related Report
      2018 Research-status Report

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Published: 2018-04-23   Modified: 2021-02-19  

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