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A Study on Rupture Occurrence and Progression due to Seepage Forces

Research Project

Project/Area Number 63550360
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field 基礎・土質工学
Research InstitutionGifu University

Principal Investigator

UNO Takao  Gifu University, Dept. of Engineering, Professor, 工学部, 教授 (70021582)

Co-Investigator(Kenkyū-buntansha) SUGII Toshio  Gifu University, Dept. of Engineering, Research Associate, 工学部, 助手 (90196709)
SATO Takeshi  Gifu University, Dept. of Engineering, Associate Professor, 工学部, 助教授 (80135326)
Project Period (FY) 1988 – 1989
Project Status Completed (Fiscal Year 1989)
Budget Amount *help
¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1989: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 1988: ¥1,100,000 (Direct Cost: ¥1,100,000)
KeywordsHydraulic Fracturing / Seepage Force / Hydraulic Gradient / Laboratory Test / Heterogeneity / Finite Element Method / 浸透破壊 / 限界動水勾配 / 進行性破壊 / 土粒子性状 / シミュレ-ション / 水平一次元透水場 / 全体破壊 / 局部破壊 / 土粒子形状 / 土粒子噛み合い効果
Research Abstract

Laboratory tests are carried out for investigating the rupture occurrence and its progression of the hydraulic fracturing within an one-dimensionally horizontal flow domain.
These tests give the conclusions ; (1) The initial rupture occurs at the hydraulic gradient of 0.1-0.3 times as small as critical one in vertically flow, (2) The shape, size and density of soil particle take an effect of the occurrence of seepage failure. According to the simple two-dimensional tests, namely, two types of seepage flow, the following are recognized (3) The direction and speed of the rupture progression varies in spite of homogeneous sample, and depends on the local heterogeneity in soil mass, (4) Bearing capacity at the ground surface falls down at the early stage of rupture progression.
From another two-dimensional experiment with bending flow zone, it is found out that : (5) The progression pattern is (1) heave at the down-stream ground surface -> (2)break-down at bending point-> (3) vertically progression reached to the surface. (6) Summation of the effective weights above bending elevation can be one of indices when we predict the failure occurrence over and near the bending zone.
The computer simulations are also developed by the aids of (a) steady state seepage flow model, (b) unsteady seepage flow through deformable material model, (c) probabilistic model.

Report

(3 results)
  • 1989 Annual Research Report   Final Research Report Summary
  • 1988 Annual Research Report
  • Research Products

    (13 results)

All Other

All Publications (13 results)

  • [Publications] 杉井俊夫: "浸透破壊の発生プロセスと土の非均質性" 土質工学会誌「土と基礎」. Vol.37. 17-22 (1989)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] 宇野尚雄: "浸透破壊における限界動水勾配と限界流速" 土質工学会中部支部第1回地盤工学シンポジウム発表講演集. 27-32 (1989)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] TAKESHI SATO: "Probabilistic Approach to Hydradic Fractwing in Heterogeneous Soil." Proc.of VIII Int.Conf.on “CMWR". (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] Toshio Sugii: "Process of Seepage Failure and Effect of heterogeneity in soil." Tsuchi-To-Kiso, Vol.37, No.6, pp.17-22, 1989.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] Takao Uno: "Critical Hydraulic Gradient and Critical Velocity causing Seepage Failure." Proc. of the 1st Regional Symposium on Geotechnical Engineering, pp.27-32, 1989.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] Takeshi Sato: "Probabilistic Approach to Hydraulic Fracturing in Heterogeneous Soil." Proc. of the VIII Int. Conf. on Computational Methods in WatResources, 1990.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] 杉井俊夫: "浸透破壊の発生プロセスと土の非均質性" 土質工学会誌「土と基礎」. 37. 17-22 (1989)

    • Related Report
      1989 Annual Research Report
  • [Publications] 宇野尚雄: "浸透破壊における限界動水勾配と限界流速" 土質工学会中部支部第11回地盤工学シンポジウム発表会講演集. 27-32 (1989)

    • Related Report
      1989 Annual Research Report
  • [Publications] TAKESHI SATO: "Probabilistic Approoch to Hydroulic Fracturing in Heterogeneous Soil." Proc of VIII Int.Conf.on“CMWR". (1990)

    • Related Report
      1989 Annual Research Report
  • [Publications] 宇野尚雄: 土木学会中部支部研究発表会講演概要集. 306-307 (1988)

    • Related Report
      1988 Annual Research Report
  • [Publications] 宇野尚雄: 第23回土質工学研究発表会発表講演集. 1857-1858 (1988)

    • Related Report
      1988 Annual Research Report
  • [Publications] 佐藤健: 土木学会第43回年次学術講演会講演概要集第III部. 856-857 (1988)

    • Related Report
      1988 Annual Research Report
  • [Publications] 杉井俊夫: 土質工学会誌 「土と基礎」. Vol.37. (1989)

    • Related Report
      1988 Annual Research Report

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Published: 1988-04-01   Modified: 2016-04-21  

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