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Elucidation of the long-term consolidation settlement behavior of soft clay after the earthquake and impact assessment on the structure foundation

Research Project

Project/Area Number 26820190
Research Category

Grant-in-Aid for Young Scientists (B)

Allocation TypeMulti-year Fund
Research Field Geotechnical engineering
Research InstitutionHokkaido University

Principal Investigator

Isobe Koichi  北海道大学, 工学(系)研究科(研究院), 准教授 (70452084)

Project Period (FY) 2014-04-01 – 2016-03-31
Project Status Completed (Fiscal Year 2015)
Budget Amount *help
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2015: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
Fiscal Year 2014: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Keywords粘土の構造 / 不かく乱試料 / 残留間隙水圧 / 地震後圧密 / 繰返し三軸試験 / 遠心模型実験 / 土水連成FE解析 / 地震 / 再圧密 / FEM解析 / 現地調査 / 地震被害 / 粘性土 / 繰返しせん断 / 圧密沈下 / 土の構造 / 有効応力解析
Outline of Final Research Achievements

Subsidence in Kashiwazaki has been observed after the earthquake of 2007. Unlike subsidence due to drawdown of groundwater level, it has become clear that there is no correlation between the subsidence and the groundwater level. The previous research has been concluded that long-term dissipation behavior of excess pore water pressure (EPWP) occurred during the earthquake is the main factor. However, because it does not match with the observations, the addition field survey was conducted to explain the remaining conditions of EPWP and understand the continuous clay soil constants. It were used to improve the accuracy of the simulation and investigate the effect on settlement behavior under various conditions. As the mechanism, focusing on the compression softening phenomenon caused by loss of the structure, through the results of the cyclic triaxial test and centrifugal model tests, it was reviewing the possibility that compression softening phenomenon occurs.

Report

(3 results)
  • 2015 Annual Research Report   Final Research Report ( PDF )
  • 2014 Research-status Report
  • Research Products

    (9 results)

All 2016 2015 2014

All Presentation (9 results)

  • [Presentation] 繰返しせん断履歴を受けた構造を有する粘土の体積圧縮挙動の評価2016

    • Author(s)
      畑中佑太,西間友洸,磯部公一
    • Organizer
      第51回地盤工学研究発表会
    • Place of Presentation
      岡山大学(岡山市)
    • Year and Date
      2016-09-13
    • Related Report
      2015 Annual Research Report
  • [Presentation] 構造を有する粘土の繰返しせん断履歴による体積圧縮挙動2016

    • Author(s)
      畑中佑太,西間友洸,磯部公一
    • Organizer
      第71回土木学会年次学術講演会
    • Place of Presentation
      東北大学(仙台市)
    • Year and Date
      2016-09-09
    • Related Report
      2015 Annual Research Report
  • [Presentation] 遠心模型実験を用いた高位構造粘土地盤の地震後圧密沈下挙動の解明2016

    • Author(s)
      西間友洸,畑中佑太,磯部公一
    • Organizer
      第71回土木学会年次学術講演会
    • Place of Presentation
      東北大学(仙台市)
    • Year and Date
      2016-09-07
    • Related Report
      2015 Annual Research Report
  • [Presentation] 繰返しせん断履歴を受けた構造を有する粘土の体積圧縮挙動の評価2016

    • Author(s)
      畑中佑太,西間友洸,磯部公一
    • Organizer
      地盤工学会北海道支部技術報告集
    • Place of Presentation
      寒地土木研究所(札幌市)
    • Year and Date
      2016-01-28
    • Related Report
      2015 Annual Research Report
  • [Presentation] 高位構造粘土地盤の地震後圧密沈下に関する遠心模型実験2016

    • Author(s)
      西間友洸,畑中佑太,磯部公一
    • Organizer
      地盤工学会北海道支部技術報告集
    • Place of Presentation
      寒地土木研究所(札幌市)
    • Year and Date
      2016-01-28
    • Related Report
      2015 Annual Research Report
  • [Presentation] 地震後長期圧密沈下予測のための構造を有する粘性土地盤の繰返しせん断挙動の把握2015

    • Author(s)
      西間友洸
    • Organizer
      第50回地盤工学研究発表会
    • Place of Presentation
      北海道,札幌市
    • Year and Date
      2015-09-01 – 2015-09-03
    • Related Report
      2014 Research-status Report
  • [Presentation] 地震後長期圧密沈下予測のための構造を有する粘性土地盤の繰返しせん断挙動の把握2015

    • Author(s)
      西間友洸,菊地侑希,磯部公一
    • Organizer
      第50回地盤工学研究発表会
    • Place of Presentation
      北海道科学大学(札幌市)
    • Year and Date
      2015-09-01
    • Related Report
      2015 Annual Research Report
  • [Presentation] 柏崎市における地震後長期沈下の検討2014

    • Author(s)
      北田宗一郎
    • Organizer
      第32回土木学会関東支部新潟会研究調査発表会
    • Place of Presentation
      新潟県,長岡市
    • Year and Date
      2014-11-05
    • Related Report
      2014 Research-status Report
  • [Presentation] 地震後も続く粘性土地盤の長期圧密沈下挙動の解明2014

    • Author(s)
      磯部公一
    • Organizer
      地盤工学会特別シンポジウム
    • Place of Presentation
      東京都
    • Year and Date
      2014-05-15 – 2014-05-16
    • Related Report
      2014 Research-status Report

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Published: 2014-04-04   Modified: 2017-05-10  

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