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Study on evaluation of stability of slope holding discontinuous plane causing slope failure

Research Project

Project/Area Number 15560427
Research Category

Grant-in-Aid for Scientific Research (C)

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

Principal Investigator

YAMAMOTO Tetsuro  Yamaguchi University, Faculty of Engineering, Professor, 工学部, 教授 (10035074)

Co-Investigator(Kenkyū-buntansha) SUZUKI Motoyuki  Yamaguchi University, Faculty of Engineering, Research Associate, 工学部, 助手 (00304494)
Project Period (FY) 2003 – 2004
Project Status Completed (Fiscal Year 2004)
Budget Amount *help
¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 2004: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 2003: ¥1,300,000 (Direct Cost: ¥1,300,000)
Keywordsdiscontinuous plane / slope failure / safety factor / rainfall / in-situ shear test / field survey / tree root / direct box shear test / 斜面崩壊 / 安定性 / 模型実験 / 表層崩壊 / 一面せん断 / 断層
Research Abstract

According to our field survey, slope failure frequently occurred along a discontinuous plane during tiny rainfall. The discontinuous planes resulting in slope failures were classified as following : 1) fractured clay in landslide area, 2) schist developed in slate, 3) thin glossy black soil adhered to joint or schist in metamorphic rock, 4) boundary plane between weakly and strongly weathered granite rocks, and 5) clay-seam interpenetrated in granite rock. During two years from 2003 to 2004, we investigated 37 sites of slope disasters occurred in Yamaguchi prefecture and then measured shear strength mobilized on the discontinuous plane in the site or the laboratory using an ultra simplified in-situ shear test apparatus. Also the direct box shear tests were performed on two types of Masado that were sampled in Ube and Iwakuni, to demonstrate the validity of the in-situ test. These test results suggested that the strength parameter obtained by the in-situ test should be used in the stability analysis of cut slopes having the discontinuous planes. Secondly, weathered slopes of the Kanmon group were surveyed on six risk factors such as height of slope, rainfall, folding etc. A fault was regarded as one of the discontinuous planes. Slopes that have the fault on the top and two more factors are prone to collapsing. The results should be effective to determine the inclinations of cut slopes. Thirdly, the tree root was taken up as an important factor related to surface failure. The direct box shear test was performed on Ube Masado mixed with tree roots. The test results showed that an increase of the apparent cohesion remarkably exhibited rather than that of the internal friction angle under condition of low overburden pressure. Finally, if the discontinuous planes are seen inside a slope, it means that possibility causing slope failure is high.

Report

(3 results)
  • 2004 Annual Research Report   Final Research Report Summary
  • 2003 Annual Research Report
  • Research Products

    (15 results)

All 2005 2004 Other

All Journal Article (13 results) Publications (2 results)

  • [Journal Article] 2004年山口県内で発生した豪雨による斜面災害2005

    • Author(s)
      山本 哲朗
    • Journal Title

      自然災害研究協議会西部地区部会報・研究論文集 29

      Pages: 79-82

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] 斜面土質調査に向けた超簡易現場せん断試験2005

    • Author(s)
      友清 智広
    • Journal Title

      第57回平成17年度土木学会中国支部研究発表会発表概要集

      Pages: 285-286

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Slope disasters caused by heavy rainfalls in Yamaguchi prefecture, 20042005

    • Author(s)
      Tetsuro Yamamoto, Motoyuki Suzuki, Naoki Takeda, Tomohiro Tomokiyo, Emi Kamimura, Yoichi Sehara, Takashi Terayama
    • Journal Title

      Western Regional Division Report of Natural Disaster Research Council No.29

      Pages: 79-82

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Ultra-simplified in-situ shear test for slope soil investigation2005

    • Author(s)
      Tomohiro Tomokiyo, Motoyuki Suzuki, Tetsuro Yamamoto
    • Journal Title

      Proceedings of the 57th annual conference of Chugoku branch, the Japan Society of Civil Engineers

      Pages: 285-286

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] 2004年山口県内で発生した豪雨による斜面災害2005

    • Author(s)
      山本哲朗
    • Journal Title

      自然災害研究協議会西部地区部会報・研究論文集 29

      Pages: 79-82

    • Related Report
      2004 Annual Research Report
  • [Journal Article] 山口県豊田町の切土による斜面崩壊について2004

    • Author(s)
      河内 義文
    • Journal Title

      自然災害研究協議会西部地区部会報・研究論文集 28号

      Pages: 43-46

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] 表層土の一面せん断試験における根茎の影響2004

    • Author(s)
      鈴木 素之
    • Journal Title

      自然災害研究協議会西部地区部会報・研究論文集 28号

      Pages: 55-58

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Characteristics of landslide and failure with their countermeasures in Kanmon-group slopes, Yamaguchi prefecture, western Japan2004

    • Author(s)
      Kochi Yoshifumi
    • Journal Title

      Journal of the Japan Landslide Society 41

      Pages: 84-93

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] 関門層群からなる切土斜面の崩壊について2004

    • Author(s)
      山本 哲朗
    • Journal Title

      土と基礎 52

      Pages: 41-43

    • NAID

      110003960307

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Case history of slope failure occurred in Kanmon group areas2004

    • Author(s)
      Yoshifumi Kochi, Naoki Takeda, Motoyuki Suzuki, Tetsuro Yamamoto
    • Journal Title

      Western Regional Division Report of Natural Disaster Research Council No.28

      Pages: 43-46

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Effect of roots on strength of surface soil in direct shear test2004

    • Author(s)
      Motoyuki Suzuki, Yousuke Biwa, Tetsuro Yamamoto
    • Journal Title

      Western Regional Division Report of Natural Disaster Research Council No.28

      Pages: 55-58

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Characteristics of landslide and failure with their countermeasures in Kanmon-group slopes, Yamaguchi prefecture, western Japan2004

    • Author(s)
      Yoshifumi Kochi, Tetsuro Yamamoto, Motoyuki Suzuki, Tadashi Nishikawa
    • Journal Title

      Journal of the Japan Landslide Society Vol.41,No.2

      Pages: 84-93

    • NAID

      10013348656

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Failure of a cut-slope consisting of the Kanmon group2004

    • Author(s)
      Tetsuro Yamamoto, Motoyuki Suzuki, Naoki Takeda, Akie Enomoto, Tomoko Ikeda, Yoshifumi Kochi
    • Journal Title

      TSUCHI-TO-KISO, JGS Vol.52,No.11

      Pages: 41-43

    • NAID

      110003960307

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Publications] 河内 義文: "山口県豊田町の切土による斜面崩壊について"自然災害研究協議会西部地区部会報・研究論文集. 28号. 43-46 (2004)

    • Related Report
      2003 Annual Research Report
  • [Publications] 鈴木 素之: "表層土の一面せん断試験における根茎の影響"自然災害研究協議会西部地区部会報・研究論文集. 28号. 55-58 (2004)

    • Related Report
      2003 Annual Research Report

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Published: 2003-04-01   Modified: 2016-04-21  

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