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Co-operative Study on a New Rock Fracture Mechanics based on Fractal Geometry

Research Project

Project/Area Number 04305001
Research Category

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

Allocation TypeSingle-year Grants
Research Field 広領域
Research InstitutionTohoku University

Principal Investigator

TAKAHASHI Hideaki  Tohoku Univ., Faculty of Engineering, Professor, 工学部, 教授 (10005267)

Co-Investigator(Kenkyū-buntansha) TAKAYASU Hideki  Tohoku Univ., Department of Information Science, Professor, 大学院情報科学研究科, 教授 (00183062)
ITO Keisuke  Kobe Univ., Faculty of Science, Professor, 理学部, 教授 (00030792)
HASHIDA Toshiyuki  Tohoku Univ., Fraculty of Engineering, Associate Professor, 工学部, 助教授 (40180814)
MATSUKI Kouji  Tohoku Univ., Faculty of Engineering, Professor, 工学部, 教授 (10108475)
ABE Hiroyuki  Tohoku Univ., Faculty of Engineering, Professor, 工学部, 教授 (00005266)
P.MEREDITH  東北大学, 工学部, 客員教授
F.OUCHTERLON  山口大学, 工学部, 教授
平田 隆幸  筑波大学, 物理工学系, 講師 (20202278)
Project Period (FY) 1992 – 1993
Project Status Completed (Fiscal Year 1993)
Budget Amount *help
¥13,600,000 (Direct Cost: ¥13,600,000)
Fiscal Year 1993: ¥3,500,000 (Direct Cost: ¥3,500,000)
Fiscal Year 1992: ¥10,100,000 (Direct Cost: ¥10,100,000)
KeywordsFRACTURE / FRACTAL / SUBSURFACE FRACTURES / NUMERICAL SIMULATION / ROCK
Research Abstract

The observed fractal nature of both fault length distributions and earthquake magnitude-frequency distribution suggests that there may be a relationship between the structure of active fault systems and the resulting seismicity. Here, we present the first experimental evidence for a correlation between the fractal dimension of fracture length distribution D and acoustic emission (AE) b-value based on a series of tensile fracture mechanics tests on crystalline rock, carried out in different environmental conditions, both air-dry water-saturated at ambient temperature and pressure. The constant stress intensity, K_I, and quantitative analyzes of the resulting fracture patterns were carried out on the same specimens. It is found that AE b-values, ranging from 1.0 to 2.3, correlate negatively with normalized stress intensity K_I/K_<IC>, where K_<IC> is the fracture toughness of the specimen. The fractal dimension of fracture length distribution D, ranges from 1.0 to 1.7. Fluid presence has a first-order influence on both the AE and structure produced in these experiments. For experiments at low stress or high fluid content, the activation of the stress corrosion mechanism for K_I<K_<IC> leads to a greater relative proportion both of small cracks and of low amplitude acoustic emissions, reflected in higher values of D and b. The fractal dimension D is found to correlate positively with the AE b-value.

Report

(3 results)
  • 1993 Annual Research Report   Final Research Report Summary
  • 1992 Annual Research Report
  • Research Products

    (12 results)

All Other

All Publications (12 results)

  • [Publications] K.Watanabe and H.Takahashi: "A Model Analysis of Long-term performance of Hot Dry Rock Geothermal Energy Extraction System" Proceeding of the JSME-ASME International Conference on Power Engineering '93. 1. 453-458 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] C.G.Hatton,I.G.Main and P.G.Meredith: "A Comparison of Seismic and Structural Measurements of Scaling Exponents during Tensile Subcritical Crack Growth" Journal of Structural Geology. 15. 1485-1495 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] I.G.Main,P.R.Sammonds and P.G.Meredith: "Application of a Modified Griffith Criterion to the Evolution of Fractal Damage during Compressional Rock Failure" Geophys.J.Int.115. 367-380 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] K.Watanabe and H.Takahashi: "Parametric Study of the Energy Extraction from Hot Dry Rock Based on Fractal Fracture Network Model" Geothermics. (未定). (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] 樋村直人、佐藤一志、高橋秀明: "準脆性材料の破壊の数値シミュレーションとAE放出挙動のフラクタル性" 機械学会論文集. (未定). (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] K.Watanabe and H.Takahashi: "A Model Analysis of Long-term performance of Hot Dry Rock Geothermal Energy Extraction System" Proceeding of the JSME-ASME International Conference on Power Engineering '93. Vol.1. 453-458 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] C.G.Hatton, I.G.Main and P.G.Meredith: "A Comparison of Seismic and Structural Measurements of Scaling Exponents during Tensile Subcritical Crack Growth" Journal of Structural Geology. Vol.15. 1485-1495 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] I.G.Main, P.R.Sammonds and P.G.Meredith: "Application of a Modified Griffith Criterion to the Evolution of Fractal Damage during Compressional Rock Failure" Geophys.J.Int.Vol.115. 367-380 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] K.Watanabe and H.Takahashi: "A Model Analysis of Long-term performance of Hot Dry Rock Geothermal Energy Extraction System" Proceeding of the JSME-ASME International Conference on Power Engineering '93. 1. 453-458 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] K.Watanabe and H.Takahashi: "Parametric Study of the Energy Extraction from Hot Dry Rock Based on Fractal Fracture Network Model" Geothermics. (未定). (1994)

    • Related Report
      1993 Annual Research Report
  • [Publications] 樋村直人、佐藤一志、高橋秀明: "準脆性材料の破壊の数値シミュレーションとAE放出挙動のフラクタル性" 機械学会論文集. (未定). (1994)

    • Related Report
      1993 Annual Research Report
  • [Publications] K.Watanabe and H.Takahashi: "Fractal Choracterization of Subsurface Fracture Network for Geothermal Energy Extra" Proc. of 18th Workshop on Geothermal Reserver Eng., Stanford. (1993)

    • Related Report
      1992 Annual Research Report

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Published: 1992-04-01   Modified: 2016-04-21  

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