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A study of improvement of physical property on decomposed granite soil depended on the difference of weathering

Research Project

Project/Area Number 08660297
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 InstitutionEhime University

Principal Investigator

MIYAUCHI Sadaki  Ehime University, Faculty of Agriculture, Professor, 農学部, 教授 (40024583)

Co-Investigator(Kenkyū-buntansha) SAKAI Toshinori  Ehime University, Faculty of Agriculture, Associate Professor, 農学部, 助教授 (90215591)
Project Period (FY) 1996 – 1997
Project Status Completed (Fiscal Year 1997)
Budget Amount *help
¥2,200,000 (Direct Cost: ¥2,200,000)
Fiscal Year 1997: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 1996: ¥1,300,000 (Direct Cost: ¥1,300,000)
Keywordsdecomposed granite soil / weathering / pF / cohesion / internal friction angle / permeability / soil moisture / improvement material for soil / 土壌改良 / 透水性 / 保水性 / 一面剪断強度
Research Abstract

In this study, we evaluated the shear strength, permeability and soil moisture on decomposed granite soil (Masa soil) depended on the difference of weathering. And, we also evaluated the improvement of these characteristics on Masa soil mixture of bentonite or bark.
The conclusions were summarized as follows ;
(1) The water content was used for an indication of soil moisture. The water contents appeared peak cohesion (C_p) and changes of internal friction angle (phi) were difference among the weathering. Index of pF was used for the indication of soil moisture. The values of pF appeared C_p and changes of phi were similar among the weathering, and the values of pF were appeared approximately 2.5. Cohesion and internal friction angle with soil moisture used index of pF exhibited similar characteristic depending on degree of weathering.
In case the water content was lower than optimum water content, Masa soil mixture of bentonite enabled to be increased Cohesion. The shear strength of Masa soil mixture of bentonite exhibited similar characteristic on Masa soil without mixture, and values of pF appeared C_p and changes of phi were also 2.5.
(2) Permeability changed remarkably with weathering. In case 2-3% of bentonite was miscible with Masa soil, sandy-loam classified by triangle coordinate on U.S.P.R.A.was satisfy with standard of permeability for core soil of earth dam (1*10^<-5>cm/s). For sand classified by U.S.P.R.A., 7-8% of bentonite was miscible with Masa soil was satisfy with standard of it. On the other hand, for sandyclay-loam classified by U.S.P.R.A., no requirement of bentonite was satisfy with standard of it. These results corresponded the field tests. Then, sandy Masa soil mixture of bentonite was possible to use the material for construction of earth dam in case of satisfying the standard of compaction.
(3) Soil moisture changed remarkable with weathering. In case 3% of bark was miscible with Masa soil, it was possible to improve the soil moisture.

Report

(3 results)
  • 1997 Annual Research Report   Final Research Report Summary
  • 1996 Annual Research Report
  • Research Products

    (12 results)

All Other

All Publications (12 results)

  • [Publications] 宮内 定基: "風化程度を異にするマサ土の剪断強度とpFとの関係について" 農業土木学会中四国支部講演要旨集. 平成8年度. 160-161 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] 宮内 定基: "バ-ク堆肥およびベントナイト混合によるマサ土の物理性の改良" 農業土木学会中四国支部講演要旨集. 平成9年度. 125-126 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] 酒井 俊典: "風化程度の異なるマサ土の締固め不飽和状態における剪断強度とpFとの関係" 農業土木学会論文集. 190. 97-103 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] T.Sakai: "The relation between soil moisture by pF and shear strength on decomposed granite soil and landslide soil in fractured zone" Proc.Int.Symposium.on Problematic Soils. (現在印刷中).

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Sadaki Miyauchi: "The relation between pF and shear strength on decomposed granite soil depended on the difference of weathering" Proc.of 52th Annual Meeting of JSIDRE Cyugoku-Shikoku Branch. 63-64 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Sadaki Miyauchi: "Improvement of physical property on decomposed granite soil mixture of bentonite and bark" Proc.of 52th Annual Meeting of JSIDRE Cyugoku-Shikoku Branch. 111-114 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Toshinori Sakai: "Relationship between shear strength and pF moisture property in compacted and unsaturated decomposed granite soils depended on the weathering" Trans.of JSIDRE. No.190. 97-103 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Toshinori Sakai: "The relation between soil moisture by pF and shear strength on decompased granite soil and landslide soil in francturel zone" Proc.Int.Symposium on Problematic Soils. (now printing). (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] 宮内 定基: "バ-ク堆肥およびベントナイト混合によるマサ土の物理性の改良" 農業土木学会中四国支部講演要旨集. 平成9年度. 125-126 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] 酒井 俊典: "風化程度の異なるマサ土の締固め不飽和状態における剪断強度とpFとの関係" 農業土木学会論文集. 190. 97-103 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] T.Sakai: "The relation between soil moisture by pF and shear strength on decomposed granite soil and landslide soli in fractured zone" Proc.Int.Symposium.on Problematic Soils. (現在印刷中).

    • Related Report
      1997 Annual Research Report
  • [Publications] 宮内定基: "風化程度を異にするマサ土の剪断強度とpFとの関係について" 農業土木学会中四国支部講演要旨集. 平成8年度. 160-161 (1996)

    • Related Report
      1996 Annual Research Report

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Published: 1996-04-01   Modified: 2016-04-21  

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