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Studies on Three-Dimensional Stability Analysis Procedure in which the Residual Factor is Incorporated

Research Project

Project/Area Number 13660247
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Irrigation, drainage and rural engineering/Rural planning
Research InstitutionUniversity of the Ryukyus

Principal Investigator

GIBO Seiichi  UNIVERSITY OF THE RYUKYUS, FACULTY OF AGRICULTURE, PROFESSOR, 農学部, 教授 (30045132)

Co-Investigator(Kenkyū-buntansha) NAKAMURA Shinya  UNIVERSITY OF THE RYUKYUS, FACULTY OF AGRICULTURE, LECTURER, 農学部, 講師 (30336359)
Project Period (FY) 2001 – 2002
Project Status Completed (Fiscal Year 2002)
Budget Amount *help
¥3,500,000 (Direct Cost: ¥3,500,000)
Fiscal Year 2002: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 2001: ¥3,000,000 (Direct Cost: ¥3,000,000)
KeywordsThree-Dimensional Stability Analysis / Landslide / Safety Factor / Slip Surface / Residual Factor / Residual Strength / Peak Strength / Strength Measurement Test / 移動ブロック / すべり面平均強度 / CAD
Research Abstract

Strength measurement tests were carried out on landslide soils which showed a considerable variation in physical and mineralogical properties in order to obtain the their strength parameters c and φ for stability analysis. Then the three-dimensional stability analysis procedure, in which the residual factor was incorporated, was examined and proposed.
The peak strength zone for strongly weathered and fractured mudstones was given by drawing the small area that reaches from the strength of c = 37.5kN/m_2 and φ = 35.0° close to the normally-consolidated strength in the c -φ figure. The parameters of normally-consolidated strength and residual strength were within the range of φ = 23 〜 30° and φ = 9 〜 17°, respectively. A fall in the strength from the peak to the residual state was clearly observed for the soil containing a large amount of silt and sand particles, and clay fraction below 20%. The variation of the strength reduction versus total contents of preferred-oriented clay minerals was expressed as a convex curve. Stress-displacement curves of landslide soils were classified into 4 types based on the total amount of minerals in soil.
In the proposed analysis procedure, the average shear strength parameter acting along the slip surface was calculated precisely and was verified to be smaller than the parameter calculated by the two-dimensional analysis, and then each domain of both the peak and residual strengths mobilized at the slide could be expressed clearly on the whole slip surface area. This procedure will be helpful in rational and effective control works for landslide.

Report

(3 results)
  • 2002 Annual Research Report   Final Research Report Summary
  • 2001 Annual Research Report
  • Research Products

    (18 results)

All Other

All Publications (18 results)

  • [Publications] 宜保清一: "盛土および基盤泥岩のせん断強度特性-沖縄,西原の泥岩すべり-"平成14年度農業土木学会大会講演会講演要旨集. 8月 津. 188-189 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] 中村真也: "残留係数を導入した二次元および三次元安定解析-沖縄,仲順地すべり-"平成14年度農業土木学会大会講演会講演要旨集. 8月 津. 202-203 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] 宜保清一: "沖縄,西原の泥岩すべりにおける盛土および基盤泥岩のせん断強度特性"第41回地すべり学会研究発表講演集. 8月 徳島. 31-34 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] 中村真也: "すべり面で発揮される強度について-沖縄,仲順地すべりの安定解析-"第41回地すべり学会研究発表講演集. 8月 徳島. 155-158 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] 宜保清一: "島尻層群泥岩のピーク強度"平成15年度農業土木学会大会講演会講演要旨集. 7月 那覇. (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] GIBO Seiichi, NAKAMURA Shinya, HIGA Yu and YOSHIZAWA Mitsuzo: "Shear Strength Characteristics of Banking and Ground Materials, Mudstone Landslide, Nishihara, Okinawa"Proceedings of 2002 Annual Conference of Japanese Society of Irrigation Drainage Reclamation Engineering, TSU. 188-189 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] NAKAMURA Shinya, GIBO Seiichi, HAYASHI Yoshitaka and OHTA Hidemasa: "Two and Three Dimensional Stability Analyses in which the Residual Factor is Incorporated -Application to the Tyunjun Landslide in Okinawa-"Proceedings of 2002 Annual Conference of Japanese Society of Irrigation Drainage Reclamation Engineering, TSU. 202-203 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] GIBO Seiichi, NAKAMURA Shinya, HIGA Yu and YOSHIZAWA Mitsuzo: "Shear Strength Characteristics of Banking and Ground Materials of the Landslide in Mudstone at Nishihara, Okinawa"Proceedings of 2002 Annual Conference of Japanese Landslide Society, TOKUSHIMA. 31-34 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] NAKAMURA Shinya, GIBO Seiichi, OHTA Hidemasa and HAYASHI Yoshitaka: "Shear Strength Acting along the Slip Surface -Three Dimensional Stability Analyses on the Tyunjun Landslide in Okinawa-"Proceedings of 2002 Annual Conference of Japanese Landslide Society, TOKUSHIMA. 155-158 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] GIBO Seiichi, NAKAMURA Shinya, HIGA Yu and YOSHIZAWA Mitsuzo: "The Peak Strength of the Shimajiri Mudstone"Proceedings of 2003 Annual Conference of Japanese Society of Irrigation Drainage Reclamation Engineering, NAHA. (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] 宜保清一: "盛土および基盤泥岩のせん断強度特性-沖縄,西原の泥岩すべり-"平成14年度農業土木学会大会講演会講演要旨集. 8月. 188-189 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] 中村真也: "残留係数を導入した二次元および三次元安定解析 -沖縄,仲順地すべり-"平成14年度農業土木学会大会講演会講演要旨集. 8月. 202-203 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] 宜保清一: "沖縄,西原の泥岩すべりにおける盛土および基盤泥岩のせん断強度特性"第41回地すべり学会研究発表講演集. 8月. 31-34 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] 中村真也: "すべり面で発揮される強度について -沖縄,仲順地すべりの安定解析-"第41回地すべり学会研究発表講演集. 8月. 155-158 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] 比嘉優: "盛土斜面で発生した地すべりのすべり面の強度 -沖縄,西原運動公園地内の泥岩地すべり-"第83回農業土木学会九州支部講演会講演要旨集. 10月. 227-228 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] 宜保清一: "島尻泥岩のピーク強度"平成15年度農業土木学会大会講演会講演要旨集. 7月. (2003)

    • Related Report
      2002 Annual Research Report
  • [Publications] 林 義隆: "CADを用いた地すべり三次兀安定解析プログラム"第37回地盤工学研究発表会講演集. 7月大阪. (2002)

    • Related Report
      2001 Annual Research Report
  • [Publications] 宜保清一: "残留係数を導入した三次元安定解析-仲順地すべり-"第37回地盤工学研究発表会講演集. 7月大阪. (2002)

    • Related Report
      2001 Annual Research Report

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Published: 2001-04-01   Modified: 2016-04-21  

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