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Development of the prevention technology of the permeable deterioration in frozen ground, non-frozen ground border of the frozen ground method water shielding wall

Research Project

Project/Area Number 17H03307
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Geotechnical engineering
Research InstitutionSetsunan University

Principal Investigator

Ito Yuzuru  摂南大学, 理工学部, 教授 (30281752)

Co-Investigator(Kenkyū-buntansha) 所 哲也  北海学園大学, 工学部, 准教授 (40610457)
石川 達也  北海道大学, 公共政策学連携研究部, 教授 (60359479)
Project Period (FY) 2017-04-01 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥17,290,000 (Direct Cost: ¥13,300,000、Indirect Cost: ¥3,990,000)
Fiscal Year 2019: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
Fiscal Year 2018: ¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
Fiscal Year 2017: ¥10,530,000 (Direct Cost: ¥8,100,000、Indirect Cost: ¥2,430,000)
Keywords凍土 / 未凍土 / 遮水 / 透水係数 / 凍結融解土 / モデル実験 / 凍土遮水壁 / 遮水性 / 通水性
Outline of Final Research Achievements

The frozen earth wall of the Fukushima Nuclear Power Plant prevents an inflow of the groundwater to the nuclear reactor building and prevents increase of the contaminated water.It is assumed that the earth wall is maintained for a long term. Then a horizontal shrinkage crack by de-hydration due to frost heave occurs in front of the ice lens, and it was assumed that the extremely great increase in hydraulic conductivity might generate in front of the frozen earth wall.
To confirm this hypothesis and to propose the preventive measure to this phenomenon, we developed the experimental device which could freeze-thaw the specimen horizontally and conduct permeability test vertically. The test result shows that even if a frost front remained at the constant position, a change of the void structure continued with time regardless of the frost-susceptibility of the fine-grained soil, and it was considered that the possibility that water shield of the earth wall was spoiled may be increasing.

Academic Significance and Societal Importance of the Research Achievements

福島原発の凍土遮水壁は現在安定しているので、事業者は凍土壁が所定の規模に成長した後は問題がないものと信じているようである。しかし、常温の地盤に構築されて長期間維持される人工凍土の研究事例は極めて少なく、ましてや隣接する未凍土に及ぼす影響が明らかになっているとは言えない。
本研究では、凍土の前面で脱水作用を受け続ける未凍土における脱水による構造変化とそれに伴う遮水性の喪失現象を解明するものであり、その成果は凍土遮水壁の安全性に関わり社会的な意義は大きい。

Report

(4 results)
  • 2019 Annual Research Report   Final Research Report ( PDF )
  • 2018 Annual Research Report
  • 2017 Annual Research Report
  • Research Products

    (11 results)

All 2020 2019 2018

All Journal Article (4 results) (of which Peer Reviewed: 4 results,  Open Access: 3 results) Presentation (7 results) (of which Int'l Joint Research: 1 results)

  • [Journal Article] Measurement for Permeability of Frozen Soil by Transient Pulse Method2020

    • Author(s)
      Tetsuya Tokoro and Tatsuya Ishikawa
    • Journal Title

      Transportation Soil Engineering in Cold Regions

      Volume: 1 Pages: 71-78

    • DOI

      10.1007/978-981-15-0450-1_8

    • ISBN
      9789811504495, 9789811504501
    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Coupled THM analysis on the Freezing -Thaw behavior of Pavement with Wicking Fabric2020

    • Author(s)
      呉 雨薇、石川 達也、安岡 朋久、Bin Luo
    • Journal Title

      地盤工学会北海道支部技術報告集

      Volume: 60 Pages: 11-18

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Relationship between the Trace of Ice Lens and the Permeability Change by Freeze-Thaw Effect2018

    • Author(s)
      HIROSE Go、Ito Yuzuru
    • Journal Title

      Journal of the Society of Materials Science, Japan

      Volume: 67 Issue: 1 Pages: 28-33

    • DOI

      10.2472/jsms.67.28

    • NAID

      130006315949

    • ISSN
      0514-5163, 1880-7488
    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] EXPERIMENTAL PREDICTION OF PERMEABILITY OF FREEZE-THAWED FINE-GRAINED SOIL2018

    • Author(s)
      HIROSE Go、ITO Yuzuru、ISHIKAWA Tatsuya、AKAGAWA Satoshi
    • Journal Title

      Journal of JSCE

      Volume: 6 Issue: 1 Pages: 156-166

    • DOI

      10.2208/journalofjsce.6.1_156

    • NAID

      130007536179

    • ISSN
      2187-5103
    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Presentation] Study on the Permeability of Unfrozen Part of Soils in Artificial Ground Freezing2019

    • Author(s)
      Go Hirose,Yuzuru Ito
    • Organizer
      The 12th International Symposium on Cold Regions Development
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 細粒土の凍上性が凍結中の未凍土部分における透水係数に与える影響2019

    • Author(s)
      廣瀬剛,伊藤譲,石川達也,赤川敏,所哲也
    • Organizer
      土木学会 第74回年次学術講演会
    • Related Report
      2019 Annual Research Report
  • [Presentation] Measurement for permeability of frozen soil by transient pluse method2019

    • Author(s)
      Tokoro, T., Ishikawa, T.
    • Organizer
      4th International Symposium on Transportation Soil Engineering
    • Related Report
      2018 Annual Research Report
  • [Presentation] Measurement of unfrozen water in unsaturated soil with pulse NMR2019

    • Author(s)
      Tokoro, T., Ishikawa, T.
    • Organizer
      7th Asia-Pacific Conference on unsaturated Soils
    • Related Report
      2018 Annual Research Report
  • [Presentation] 細粒土の凍結時に未凍土部分で生じる収縮クラックの透水係数に与える影響について2018

    • Author(s)
      広瀬剛,伊藤譲,石川達也,赤川敏,所哲也,大西有三
    • Organizer
      土木学会第73回年次学術講演会
    • Related Report
      2018 Annual Research Report
  • [Presentation] Water, heat and electric current flow in saturated and unsaturated sandy soil2018

    • Author(s)
      Tokoro, T., Ishikawa, T.
    • Organizer
      7th International Conference on Unsaturated Soils
    • Related Report
      2018 Annual Research Report
  • [Presentation] 飽和細粒土における工学的性質を把握するための凍結水量の測定方法2018

    • Author(s)
      塚本光佑,伊藤譲
    • Organizer
      第13回材料学会地盤改良シンポジウム
    • Related Report
      2018 Annual Research Report

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Published: 2017-04-28   Modified: 2021-02-19  

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