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Development of economic hybrid type liquefaction countermeasure for existing structure by combining pore water pressure dissipation method with continuous underground wall

Research Project

Project/Area Number 19K15086
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 22030:Geotechnical engineering-related
Research InstitutionNagoya Institute of Technology

Principal Investigator

Morikawa Yukihiro  名古屋工業大学, 工学(系)研究科(研究院), 助教 (20710239)

Project Period (FY) 2019-04-01 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2020: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2019: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
Keywords液状化対策 / 液状化 / 格子状地盤改良 / 間隙水圧消散工法 / 戸建て住宅 / 既設小規模構造物 / 模型実験 / 排水工法 / 地中連続壁 / 浮き型格子状地盤改良 / 既設構造物
Outline of Research at the Start

本研究では既設小規模構造物にも経済的に適用可能な液状化対策工法として,小規模な地中連続壁と安価な排水工法を組み合わせたハイブリッド型液状化対策を開発する.本研究で対象とする地中連続壁は従来のように液状化を完全に防止するのではなく,あえて液状化の発生を許容することで小規模な改良範囲にとどめ,それにより小型施工機による施工を可能にすることで既設構造物への適用性,経済性を向上させる.一方で,小規模な地中連続壁に安価な排水工法を併用することで液状化地盤の流動性を低減させ,効率的・経済的に液状化被害を低減する.

Outline of Final Research Achievements

In this study we investigated the economic hybrid type liquefaction countermeasure for existing structure that combines a floating grid type improvement method and the pore water pressure dissipation method. As a result of the study, it was found that the settlement damage of the structure due to liquefaction can be suppressed by the floating grid type improvement with a grid spacing of 1.2 to 1.4 times the width of the structure and an improvement depth of about twice the width of the structure. In addition, it was found that the floating grid type improvement with impermeable improvement body assuming general ground improvement could not reduce the inclination damage of structure, but the floating grid type improvement with drainage improvement body could reduce both settlement damage and tilt damage of structure.

Academic Significance and Societal Importance of the Research Achievements

本研究によって,浮き型格子状地盤改良に間隙水圧消散工法を組み合わせたハイブリッド型液状化対策は既設構造物の沈下被害と傾斜被害の両方を低減できることが明らかとなり,傾斜被害の抑制には排水性改良体が重要であることも明らかとなった.従来の地盤改良工法では経済的に住宅などの既設構造物を液状化被害から守ることは困難であったが,本研究成果はその可能性を示し,国土強靭化に大きく貢献できると考えられる.

Report

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

    (17 results)

All 2021 2020 2019

All Journal Article (4 results) (of which Peer Reviewed: 4 results,  Open Access: 4 results) Presentation (13 results) (of which Int'l Joint Research: 1 results)

  • [Journal Article] New Chemical Grouting Method Using Ultrasonic Vibration2020

    • Author(s)
      森河由紀弘,本谷洋二,岡田宙,野口好夫,石田明人
    • Journal Title

      Journal of the Society of Materials Science, Japan

      Volume: 69 Issue: 1 Pages: 63-68

    • DOI

      10.2472/jsms.69.63

    • NAID

      130007787252

    • ISSN
      0514-5163, 1880-7488
    • Year and Date
      2020-01-15
    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] LIQUEFACTION DAMAGE SUPPRESSION EFFECTS OF EXISTING SMALL SCALE STRUCTURE RECEIVING ECCENTRIC LOAD USING FLOATING GRID-TYPE IMPROVEMENT2020

    • Author(s)
      中谷一貴,森河由紀弘,中井健太郎,前田健一,野田利弘
    • Journal Title

      Journal of Japan Society of Civil Engineers, Ser. A2 (Applied Mechanics (AM))

      Volume: 76 Issue: 2 Pages: I_279-I_288

    • DOI

      10.2208/jscejam.76.2_I_279

    • NAID

      130007980142

    • ISSN
      2185-4661
    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Numerical Analysis on Mechanism of Dewatering as a mitigation method Against Liquefaction2020

    • Author(s)
      Y. Morikawa and H. Cho
    • Journal Title

      International Journal of GEOMATE

      Volume: Vol.18, Issue 66 Issue: 66 Pages: 68-75

    • DOI

      10.21660/2020.66.9407

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] REDUCTION EFFECTS OF LIQUEFACTION DAMAGE USING SMALL SCALE FLOATING GRID-TYPE IMPROVEMENT FOR EXISTING SMALL SCALE STRUCTURE2019

    • Author(s)
      森河由紀弘,中井健太郎,中谷一貴,武田祐輔,前田健一,野田利弘
    • Journal Title

      Journal of Japan Society of Civil Engineers, Ser. A2 (Applied Mechanics (AM))

      Volume: 75 Issue: 2 Pages: I_329-I_339

    • DOI

      10.2208/jscejam.75.2_I_329

    • NAID

      130007795438

    • ISSN
      2185-4661
    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] 排水改良体を用いた浮き型格子状地盤改良による過剰間隙水圧と地盤変位の抑制効果2021

    • Author(s)
      花田響,森河由紀弘,中谷一貴,前田健一,佐藤智範
    • Organizer
      第56回地盤工学研究発表会
    • Related Report
      2020 Annual Research Report
  • [Presentation] 不透水性改良体に排水性改良体を組み合わせた浮き型格子状地盤改良による液状化対策2021

    • Author(s)
      花田響,森河由紀弘,中谷一貴,前田健一,佐藤智範
    • Organizer
      土木学会令和3年全国大会度第76回年次学術講演会
    • Related Report
      2020 Annual Research Report
  • [Presentation] 浮き型格子状地盤改良による既設小規模構造物の液状化時傾斜被害の抑制効果2020

    • Author(s)
      中谷一貴,森河由紀弘,中井健太郎,前田健一,野田利弘
    • Organizer
      第23 回応用力学シンポジウム
    • Related Report
      2020 Annual Research Report
  • [Presentation] 既設小規模構造物を対象とした浮き型格子状地盤改良の傾斜被害抑制効果2020

    • Author(s)
      中谷一貴,高木要,森河由紀弘,前田健一,佐藤智範
    • Organizer
      第55回地盤工学研究発表会
    • Related Report
      2020 Annual Research Report
  • [Presentation] 液状化に伴う構造物の傾斜被害に着目した浮き型格子状地盤改良の対策効果2020

    • Author(s)
      中谷一貴,森河由紀弘,高木要,前田健一,佐藤智範
    • Organizer
      土木学会令和2年全国大会度第75回年次学術講演会
    • Related Report
      2020 Annual Research Report
  • [Presentation] 既設小規模構造物を対象とした浮き型格子状地盤改良による液状化対策効果2020

    • Author(s)
      中谷一貴,森河由紀弘,前田健一,佐藤智範
    • Organizer
      第32回中部地盤工学シンポジウム
    • Related Report
      2020 Annual Research Report
  • [Presentation] 既設小規模構造物を対象とした排水性浮き型格子状地盤改良による液状化時の傾斜被害抑制効果2020

    • Author(s)
      中谷一貴,森河由紀弘,前田健一,高木要,佐藤智範
    • Organizer
      第14回地盤改良シンポジウム
    • Related Report
      2020 Annual Research Report
  • [Presentation] 小規模な格子状地盤改良による液状化被害の低減効果2019

    • Author(s)
      森河由紀弘,中井健太郎,中谷一貫,武田祐輔,前田健一,野田利弘
    • Organizer
      土木学会 第22回土木学会応用力学シンポジウム
    • Related Report
      2019 Research-status Report
  • [Presentation] 既設小規模構造物を対象とした格子状改良の最適な改良間隔・改良深度の検討2019

    • Author(s)
      中谷一貴,武田祐輔,森河由紀弘,前田健一,佐藤智範
    • Organizer
      地盤工学会 第54回地盤工学研究発表会
    • Related Report
      2019 Research-status Report
  • [Presentation] 超音波振動を用いた効果的な薬液注入2019

    • Author(s)
      森河由紀弘,本谷洋二,岡田宙,野口好夫,石田明人
    • Organizer
      地盤工学会 第54回地盤工学研究発表会
    • Related Report
      2019 Research-status Report
  • [Presentation] 既設小規模構造物を対象とした排水性格子状改良の液状化対策効果2019

    • Author(s)
      中谷一貴,森河由紀弘,前田健一,佐藤智範
    • Organizer
      土木学会 第74回年次学術講演会
    • Related Report
      2019 Research-status Report
  • [Presentation] 破砕瓦の裏込め材としての適用性2019

    • Author(s)
      森河由紀弘,佐藤智範,前田健一,神谷彦二,進藤祐造
    • Organizer
      土木学会 第74回年次学術講演会
    • Related Report
      2019 Research-status Report
  • [Presentation] Applicability of crushed roof tile as ground material2019

    • Author(s)
      Y. Morikawa, K. Maeda, T. Sato, H. Kamiya
    • Organizer
      International Workshop on Computational Geo-Environmental Mechanics 2019(IWS MAURITIUS 2019)
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research

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Published: 2019-04-18   Modified: 2022-01-27  

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