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Predict Failure of Shirasu Slope in Consideration of Patterns of Rainfall and Unsaturated Seepage

Research Project

Project/Area Number 02650350
Research Category

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

Allocation TypeSingle-year Grants
Research Field 基礎・土質工学
Research InstitutionKagoshima National College of Technology

Principal Investigator

OKABAYASHI Takumi  Kagoshima National College of Technology, Civil Engineering, Associate Professor, 土木工学科, 助教授 (40044630)

Co-Investigator(Kenkyū-buntansha) MAENO Yuuji  Kagoshima National College of Technology, Civil Engineering, Lecturer, 土木工学科, 講師 (20190316)
UCHITANI Tamotu  Kagoshima National College of Technology, Civil Engineering, Associate Professor, 土木工学科, 助教授 (70038107)
SUGIO Satoru  Miyazaki University, Civil Engineering, Professor, 工学部・土木工学科, 教授 (70069524)
HIRATA Tokio  Kagoshima National College of Technology, Civil Engineering, Professor, 土木工学科, 教授 (40038112)
松本 弘巳  鹿児島工業高等専門学校, 一般科目, 教授 (20106115)
Project Period (FY) 1990 – 1991
Project Status Completed (Fiscal Year 1991)
Budget Amount *help
¥1,900,000 (Direct Cost: ¥1,900,000)
Fiscal Year 1991: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1990: ¥1,400,000 (Direct Cost: ¥1,400,000)
KeywordsRainfall / Special Soil / Shirasu / Slope Stability / Seepage / Volumetric Water Content / Pressure Head / Finite Element Method / 火山噴出物 / 火山灰 / 斜面安定 / 不飽和浸透 / 降雨パタ-ン / 土質力学
Research Abstract

Shiras is a pumic-flow deposit soil widely distributed in southern Kyushu and oilier districts in Japan, and is counted to be a typical collapsible soil for its frequent damages mainly owning to rainfall and earthquakes. Such a soil seems to be similar to the yellow-brown pumice soil in North Island, New Zealand, the cemented-sand in the U. S. A., and the volcanic ash soil in Central America. The strength characteristics of the undisturbed Shirasu are different from those of the disturbed Shirasu, since undisturbed samples have tensile strengh due to a geological cause.
It is well known that Shirasu becomes very collapsible after increasing the moisture content. Many studies on failure of slope by rainfall have been done by many laboratories. The failure mechanism of Shirasu has not been clarified yet, because the mechanisum of it by rainfall is very complicated.
The conclusion drawn were as follows ;
(1) The patern of rainfall in Southern Kyushu was become clear.
(2) This study make it clear about the relation between unsaturated coefficent of permeability, water content by volume and suction of Shirasu.
(3) The triaxial test results make clear characteristics of soil mechanics and liquefaction in Shirasu.
(4) This paper refers to characteristics of unsaturated seepage of Shirasu slopes in raifall.

Report

(3 results)
  • 1991 Annual Research Report   Final Research Report Summary
  • 1990 Annual Research Report
  • Research Products

    (13 results)

All Other

All Publications (13 results)

  • [Publications] 岡林 巧,村田 秀一,兵動 正幸,山本 陽一,岸本 洋: "しらすの液状化特性について" 地般と建設. 9. (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] 桑畑 英紀,杉尾 哲,岡林 巧: "しらす地盤における野外浸透実験" 土木学会西部支部研究発表会講演概要集. 304-305 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] 岡林 巧,村田 秀一,兵動 正幸,安福 規之,山本 陽一,岸本 洋: "乱したしらすの非排水せん断特性" 第27回土質工学研究発表会講演集. (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] 村田 秀一,兵動 正幸,安福 規之,岸本 洋,岡林 巧,山本 陽一: "乱したしらすの非排水繰返しせん断特性" 第27回土質工学研究発表会講演集. (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] 村田 秀一,兵動 正幸,岸本 洋,岡林 巧: "しらすの繰返しせん断挙動について" 土木学会中国四国支部研究発表会講演概要集. (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] T. OKABAYASHI: "Liquefaction Property of SHIRASU" Ground Engineering. 9, No. 1. 81-91 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] T. OKABAYASHI: "Undrained Shearing Properties of disturbed Shirasu" The 27th Japan Ntional Conference on Soil Mechanics and Foundation Engineering. (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] H. MURATA: "Undrained Cyclic Shear Characteristics of Shirasu" The 27th Japan Ntional Conference on Soil Mechanics and Foundation Engineering. (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] 桑畑 英紀,杉尾 哲,岡林 巧: "しらす地盤における野外浸透実験" 土木学会西部支部研究発表会講演概要集. 304-305 (1992)

    • Related Report
      1991 Annual Research Report
  • [Publications] 岡林 巧: "桜島火山噴出物の大型三軸圧縮試験" 鹿児島工業高等専門学校研究報告. 25. 61-67 (1991)

    • Related Report
      1990 Annual Research Report
  • [Publications] 杉尾 哲,井上 徹: "不飽和士の透水係数の測定" 宮崎大学工学部研究報告. 36. 59-66 (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] 岡林 巧,杉尾 哲,木原 正人,村尾 俊行: "乱さないしらすの不飽和浸透特性" 土木学会西部支部研究発表会講演概要集. 468-469 (1991)

    • Related Report
      1990 Annual Research Report
  • [Publications] 岡林 巧,畑中 孝文,杉野 貴洋: "供試験の寸法の違いが三軸圧縮試験に及ぼす影響" 土木学会西部支部研究発表会講演概要集. 478-479 (1991)

    • Related Report
      1990 Annual Research Report

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Published: 1990-04-01   Modified: 2016-04-21  

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