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1992 Fiscal Year Final Research Report Summary

Rock Stress Measurement by Hydraulic Fracturing with Hemispherical-ended Borehole

Research Project

Project/Area Number 03452241
Research Category

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

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

Principal Investigator

OKAMURA Hiroshi  Kumamoto University, Faculty of Engineering, Professor., 工学部, 教授 (40040373)

Co-Investigator(Kenkyū-buntansha) KOIKE Katsuaki  Kumamoto University, Faculty of Engineering, Associate Professor., 工学部, 助手 (80205294)
NAKAYAMA Tomoharu  Kumamoto University, Faculty of Engineering, Associate Professor., 工学部, 助手 (70207950)
KANEKO Katsuhiko  Kumamoto University, Faculty of Engineering, Associate Professor., 工学部, 助教授 (20128268)
OBARA Yuzo  Kumamoto University, Faculty of Engineering, Associate Professor., 工学部, 助教授 (50135315)
SUGAWARA Katsuhiko  Kumamoto University, Faculty of Engineering, Professor., 工学部, 教授 (60109668)
Project Period (FY) 1991 – 1992
KeywordsRock Stress Measurement / Hydraulic Fracturing / Finite Element Method / Hemispherical-ended Borehole Technique
Research Abstract

Recent development in relation to prediction of structural stability of large rock cavern has indicated the need for systematic stress measurements in the field, e.g. systematic measurement of the stress distributions around caverns. In the hydraulic fracturing to determine the state stress at a certain point within a rock mass, the fracture phenomena of a borehole surface, which is a function of the field stress, needs to be measured by applying hydraulic pressure into the borehole. Hydraulic fracturing with hemispherical-ended borehole is very similar to conventional hydraulic fracturing except for the location of applying hydraulic pressure, namely the pressure at the borehole bottom surface which is formed hemispherically. This method has a possibility to measure the three dimensional stress state in rock mass in a single borehole.
Firstly, hydraulic fracturing of spherical cavity in infinite rock mass is suggested. Then the fracture phenomena are analyzed by the stress coefficients determined theoretically on the surface of the cavity. It is clarified that two magnitudes and three directions of the principal stresses of rock stress are determined by this method. Secondly hydraulic fracturing with hemispherical-ended borehole is suggested and the stress coefficients are determined by FEM for analyzing fracture phenomena at borehole bottom surface. Finally, analyzing the fracture phenomena on the hemispherical-ended borehole surface under general three dimensional rock stresses, it is made clear that those are dominated by the deferential stress, the directions of principal stresses, the tensile strength of rock mass and so on. It is concluded that the rock stress can be determined by the hydraulic fracturing with hemispherical-ended borehole.

  • Research Products

    (8 results)

All Other

All Publications (8 results)

  • [Publications] K.Sugawara: "MEASUREMENT OF IN-SITU ROCK STRESS BY HEMISPHERICAL-ENDED BOREHOLE TECHNIQUE" Mining Science and Technology. 3. 287-300 (1986)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.SUGAWARA,K.KANEKO,Y.OBARA,H.OKAMURA: "Determination of the State of Stress in Rock by the Measurement of Strains on the Hemispherical Borehole Bottom" Proc.of INT.Symp on Large Rock Caverns. 2. 1039-1050 (1986)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.SUGAWARA,Y.OBARA,K.KANEKO,T.AOKI: "Hemispherical-ended borehole technigue for measurement of absolute rock stress" Proc.of INT.Symp on Rock Stress and Rock Stress Measurements. 207-216 (1986)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 尾原 祐三,菅原 勝彦,荒木 秀郎,有賀 義明: "スリーブフラクチャリング法による岩盤応力測定" 材料. 38. 13-19 (1988)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.SUGAWARA and Y.OBARA: "Measurement of In-situ Rock Stress by Hemispherical-ended Borehole Technique" J. of Mining Science and Technology. Vol.3. 287-300 (1986)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.SUGAWARA, K.KANEKO, Y.OBARA and H.OKAMURA: "Determination of the State of Stress in Rock by the Measurement of Strains on the Hemispherical Borehole Bottom." Proc. of Int. Symp on Large Rock Caverns. Vol.2. 1039-1050 (1986)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.SUGAWARA, Y.OBARA, K.KANEKO and T.AOKI: "Hemispherical-ended Borehole Technique for Measurement of Absolute Rock Stress" Proc. of Int, Symp on Rock Stress and Rock Stress Measurement. 207-216. (1986)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y.OBARA, K.SUGAWARA, H.ARAKI and Y.ARIGA: "Rock Stress Measurement by Sleeve Fracturing Technique" J. of the Society of Materials Science, JAPAN. Vol.38. 221-227 (1988)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1994-03-24  

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