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Durability of the cement-treated clay ground constructed in coastal area

Research Project

Project/Area Number 18K04348
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 InstitutionUniversity of Miyazaki

Principal Investigator

Suetsugu Daisuke  宮崎大学, 工学部, 教授 (30423619)

Co-Investigator(Kenkyū-buntansha) 日野 剛徳  佐賀大学, 理工学部, 教授 (20295033)
Project Period (FY) 2018-04-01 – 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 2020: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2019: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2018: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Keywordsセメント処理土 / 透水性 / 強度 / 劣化 / 海水 / セメント改良地盤 / 耐久性 / セメント改良土
Outline of Final Research Achievements

When saline groundwater begins to flow into cement-treated soil, its permeability decreases. As salt continues to flow into the treated soil, the permeability increases. This phenomenon is caused by the improved pore size of the treated soil as calcium leaches out.
As calcium is leached from the treated soil, the soil gradually changes from expansive to compressible, and the shear strength of the treated soil decreases. A residual amount of calcium that causes a rapid decrease in shear strength exists, which depends on the amount of cement added when mixing the soil.

Academic Significance and Societal Importance of the Research Achievements

海水と接触するセメントや石灰で混合処理された土は固化成分のカルシウムの溶脱が促進され劣化が進行する。そのメカニズムはほぼ明らかにされてきたが、劣化の進行に伴う力学的特性の変化はほとんど明らかにされていなかった。本研究では劣化の進行に伴う処理土の透水性と強度変形特性の変化を明らかにした。これらの成果は固化処理工法で安定化された地盤の長期的な安定性の理解ならびに評価手法の開発に資する知見である。

Report

(6 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • 2020 Research-status Report
  • 2019 Research-status Report
  • 2018 Research-status Report
  • Research Products

    (5 results)

All 2021 2020 2019

All Journal Article (2 results) (of which Peer Reviewed: 2 results) Presentation (3 results)

  • [Journal Article] カルシウム溶脱を受けたセメント処理粘土のせん断強度特性2020

    • Author(s)
      末次大輔,井上徹郎,原弘行
    • Journal Title

      第14回地盤改良シンポジウム論文集

      Volume: 14 Pages: 79-82

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Journal Article] Effects of seawater infiltration on permeability of the cement treated soil2019

    • Author(s)
      T.Inoue and D.Suetsugu
    • Journal Title

      Proc. of Technical forum on mitigation of geo-disasters in Asia

      Volume: -

    • Related Report
      2019 Research-status Report
    • Peer Reviewed
  • [Presentation] 海水に接触するセメント処理土のカルシウム溶出予測の検討2021

    • Author(s)
      皿良和樹,末次大輔,神山惇,福林良典
    • Organizer
      第56回地盤工学研究発表会
    • Related Report
      2021 Research-status Report
  • [Presentation] 塩水浸透劣化に伴うセメント処理土の強度特性の変化2020

    • Author(s)
      井上徹郎,末次大輔
    • Organizer
      第55回地盤工学研究発表会
    • Related Report
      2020 Research-status Report
  • [Presentation] 塩水浸透劣化に伴うセメント処理土の強度特性の変化2020

    • Author(s)
      井上徹郎,末次大輔
    • Organizer
      令和元年度土木学会西部支部研究発表会
    • Related Report
      2019 Research-status Report

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Published: 2018-04-23   Modified: 2024-01-30  

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