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Studies on Rock Mass Classification for Mining Design

Research Project

Project/Area Number 60302077
Research Category

Grant-in-Aid for Co-operative Research (A)

Allocation TypeSingle-year Grants
Research Field 資源開発工学
Research InstitutionKyoto University

Principal Investigator

SASSA Koichi  Faculty of Eng., Kyoto Univ., Professor., 工学部, 教授 (40025953)

Co-Investigator(Kenkyū-buntansha) SAITO Tokumi  Faculty of Eng., Iwate Univ., Assoc. Prof., 工学部, 助教授 (20113855)
SATO Shichiro  Faculty of Eng., Iwate Univ., Assoc. Prof., 工学部, 助教授 (00003830)
KANEKO Katsuhiko  Faculty of Eng., Kumamoto Univ., Assoc. Prof., 工学部, 助教授 (20128268)
OHMI Michito  Faculty of Eng., Kumamoto Univ., Assoc. Prof., 工学部, 助教授 (30040405)
SUGANO Tsuyoshi  Faculty of Eng., Kyoto Univ., Instructor., 工学部, 助手 (60026151)
Project Period (FY) 1985 – 1986
Project Status Completed (Fiscal Year 1986)
Budget Amount *help
¥4,900,000 (Direct Cost: ¥4,900,000)
Fiscal Year 1986: ¥1,900,000 (Direct Cost: ¥1,900,000)
Fiscal Year 1985: ¥3,000,000 (Direct Cost: ¥3,000,000)
KeywordsRock Mass Clasification / Seismic Prospecting / Evaluation of Rock Mass In-situ / Deformability of Rock Mass In-situ / Crack Model / Exploration Geophysics / 岩盤調査
Research Abstract

The results obtained are itemized below.
1. It is clarified both experimentally and numerically that P wave velocities in rock mass with water-saturated cracks are not a time average velocity proposed by Wyllie et al.
2. P wave velocities in rock mass with water-saturated cracks decrease with increase of the number of cracks even if the sum of the thickness of the cracks remains constant.
3. The arrival time of P wave which can be detected from the field records is mainly controlled by the superposition of the waves having multiple reflections within the cracks in their ray-path.
4. From the results of a field measurement performed at the under-ground mining the relation between mining method and rock mass clasification is clarified.
5. The variation of P wave velocity with respect to water content can be quantitatively illustrated by the use of a pore model with mixed aspect ratios.
6. Deformability of rock mass is discussed by using the crack model, and it is clarified that the deformability of rock mass can be estimated by measuring the P wave velocity of rock mass, the crack density in-situ, and the mechanical properties of the spacimen.

Report

(1 results)
  • 1986 Final Research Report Summary
  • Research Products

    (8 results)

All Other

All Publications (8 results)

  • [Publications] 佐々宏一: 日本鉱業振興会研究成果報告書. 27-32 (1986)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] 佐藤七郎: 日本鉱業会誌. 102. 553-559 (1986)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] 金子勝比古: 日本鉱業会秋季大会論文集. N-1. 1-4 (1986)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] 佐々宏一: 日本鉱業会誌.

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] SASSA, Koichi: "Estimation and Clasification of Rock Mass of Mine Evaluation" Research Report of the Mining Promotion Foundation, Japan. 27-32 (1986)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] SATO, Shichiro: "A Study on the Model Fitting of the Distribution of Pore shapes in Granite Using the Elastic Theory of Composite Materials" Jour. of the Mining and Metallurgical Institute of Japan. 102. 553-559 (1986)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] KANEKO, Katsuhiko: "Evaluation of Discontinuity of Rock Mass" Proceeding of Fall Meeting of MMIJ, Japan. N-1. 1-4 (1986)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] SASSA, Koichi: "Exsistence of Thin Layer on Elastic Wave Propagation" Jour. of the MMIJ, Japan.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1986 Final Research Report Summary

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Published: 1987-03-31   Modified: 2016-04-21  

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