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PERMEABILITY AND COMPRESSIBILITY OF MIXED SOIL COMPOSED OF VOLCANIC COHESIVE SOIL AND SHIRASU

Research Project

Project/Area Number 62560240
Research Category

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

Allocation TypeSingle-year Grants
Research Field 農業土木
Research InstitutionKagoshima University

Principal Investigator

NANBA Naohiko  KAGOSHIMA UNIVERSITY . FACULTY OF AGRICULTURE PROFESSOR, 農学部, 教授 (60041612)

Co-Investigator(Kenkyū-buntansha) WAKAMATSU Chiaki  KAGOSHIMA UNIVERSITY . FACULTY OF AGRICULTURE ASSISTANT, 農学部, 助手 (70041647)
MIWA Koichi  KAGOSHIMA UNIVERSITY . FACULTY OF AGRICULTURE ASSISTANT PROFESSOR, 農学部, 助教授 (40032099)
Project Period (FY) 1987 – 1989
Project Status Completed (Fiscal Year 1989)
Budget Amount *help
¥2,300,000 (Direct Cost: ¥2,300,000)
Fiscal Year 1989: ¥400,000 (Direct Cost: ¥400,000)
Fiscal Year 1988: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 1987: ¥1,000,000 (Direct Cost: ¥1,000,000)
KeywordsKuroboku Soil / Shirasu / Mixed Soil / Impervious Soil / クロボク / 排水強度 / 圧密係数 / 不飽和透水係数 / 粒子破砕 / 三軸圧縮強度 / 混合モデル / 変形解析
Research Abstract

The purpose of this research is to find out suitable soil material as an impervious one. Kuroboku soil for a cohesive soil and Shirasu for a sandy soil were chosen in this subject. The results obtained are as follows.
1. In case the mix ratio of Shirasu is below 50%, the mixed soil comes to show physical properties similar to Kuroboku soil ; while when it is above 70%, the mixed one comes to show those similar to Shirasu. The maximum dry density of it shows the high value as the ratio increases.
2. The shearing characteristics are subjected to the initial density, confining pressure and crushing of grain. For these factors, the increment of deviator stress is reduced with increasing of strain. As a result of it, values of angle of shearing resistance at the high confining pressure are lower than those at low pressure.
3. The mixed soil containing the sand fraction of 65% is the impervious material having the coefficient of permeability of 10^<-6>cm/sec, the cohesion of 0.4 kgf/cm^2 and the angle of internal friction of 25 degree.
Judging from these results, the mixed material compacted at the mix ratio of about 60% is considered to be the most suitable impervious material below 0.2 of compression index.

Report

(4 results)
  • 1989 Annual Research Report   Final Research Report Summary
  • 1988 Annual Research Report
  • 1987 Annual Research Report
  • Research Products

    (16 results)

All Other

All Publications (16 results)

  • [Publications] 三輪晃一: "クロボク・シラス混合土の非排水強度特性" 農業土木学会論文集. 138. 69-74 (1988)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] 若松千秋: "高拘圧下におけるシラスのせん断特性" 鹿児島大学・農学部 学術報告. 39. 293-300 (1989)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] 三輪晃一: "クロボク・シラス混合土の工学的性質" 鹿児島大学 農学部 学術報告. 39. 301-307 (1989)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] 平瑞樹: "有限要素法によるシラスの破壊に関する非線形弾性解析" 鹿児島大学 農学部 学術報告. 40. (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] Koichi Miwa: "Undrained Strength Characteristics of Kuroboku-Shirasu Mixed Soil" Trans. JSIDRE. 138. 69-74 (1988)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] Chiaki Wakamatsu: "Drained Shear Characteristics of SHIRASU under High Confining Pressure" Bull. Facu. Agri. Kagoshima Univ., 39, 293-300, 1989.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] Koichi Miwa: "Engineering Properties of Compacted KUROBOKU-SHIRASU Mixtures" Bull. Facu. Agri. Kagoshima Univ., 39, 301-307, 1989.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] Mizuki Hira: "Nonlinear Elastic Analysis on Failure of SHIRASU by Finite Element Method" Bull. Facu. Agri. Kagoshima Univ., 40, 1990.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] 三輪晃一: "クロボク・シラス混合土の非排水強度特性" 農業土木学会論文集. 138. 69-74 (1988)

    • Related Report
      1989 Annual Research Report
  • [Publications] 若松千秋: "高拘圧下におけるシラスのせん断特性" 鹿児島大学農学部学術報告. 39. 293-300 (1989)

    • Related Report
      1989 Annual Research Report
  • [Publications] 三輪晃一: "クロボク・シラス混合土の工学的性質" 鹿児島大学農学部学術報告. 39. 301-307 (1989)

    • Related Report
      1989 Annual Research Report
  • [Publications] 平瑞樹: "有限要素法によるシラスの破壊に関する非線形弾性解析" 鹿児島大学農学部学術報告. 40. (1990)

    • Related Report
      1989 Annual Research Report
  • [Publications] 三輪晃一: 農業土木学会論文集. 138. 69-74 (1988)

    • Related Report
      1988 Annual Research Report
  • [Publications] 若松千秋: 鹿児島大学農学部学術報告. 39. 293-300 (1989)

    • Related Report
      1988 Annual Research Report
  • [Publications] 三輪晃一: 鹿児島大学農学部学術報告. 39. 301-306 (1989)

    • Related Report
      1988 Annual Research Report
  • [Publications] 三輪晃一: 農業土木学会論文集.

    • Related Report
      1987 Annual Research Report

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Published: 1987-04-01   Modified: 2016-04-21  

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