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Fracture Mechanics Study of Shear Type Fracture Process Zone in Microcracking Materials

Research Project

Project/Area Number 10650068
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Materials/Mechanics of materials
Research InstitutionTOHOKU UNIVERSITY

Principal Investigator

HASHIDA Toshiyuki  Graduate School of Engng., Tohoku Univ. Prof., 大学院・工学研究科, 教授 (40180814)

Co-Investigator(Kenkyū-buntansha) SATO Kazushi  Mech. Engng. Dep., Miyagi National College of Technology, Prof., 機械工学科, 助教授 (80235324)
Project Period (FY) 1998 – 1999
Project Status Completed (Fiscal Year 1999)
Budget Amount *help
¥3,500,000 (Direct Cost: ¥3,500,000)
Fiscal Year 1999: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 1998: ¥2,500,000 (Direct Cost: ¥2,500,000)
KeywordsGeothermal Energy Extraction / Hydraulic Fracture Growth / Shear Type Fracture Process Zone / Multiple Cracking / Confining Pressure / Fracture Criterion / Shear Weakening Model / Embedded Crack Element / 水圧破砕き裂進展
Research Abstract

The objective of this research is to develop a fracture mechanics method for predicting the growth of hydraulically driven cracks in deep-seated rock masses for next generation geothermal energy extraction. The research results are described below for the each research task (I-IV).
Task (I) : Fracture criterion of rocks
Tension and compression tests of Iidate granite were conducted at confining pressures up to 150 MPa and pore pressure up to 50 MPa. Tension softening and shear weakening curves were deduced from the test results. It was shown that the deduced experimental curves were independent of the confining and pore pressures used in this study, and that the relationships can be employed for analyzing the mixed mode crack growth.
Task (II) : Simulated hydraulic fracturing experiment
Mini-hydraulic fracturing tests were performed on thick-walled cylindrical specimens under a variety of confining pressure. The tests indicated that an opening type crack was created when the differential stress was less than 100 MPa and a shear type crack was initiated if the differential stress exceeded 100 MPa. This observation suggests that shear fracture may be induced by hydraulic injection in deep-seated rock masses.
Task (III) : FEM code for analyzing the growth of hydraulically driven cracks A FEM code was newly developed by employing an embedded crack element. The fracture criterion determined in Task (I) was incorporated into the code the crack growth condition.
Task (IV) : Numerical analysis of hydraulic fracturing and formation process of artificial reservoirs. The hydraulic crack growth at depth was examined using the FEM code under a typical tectonic stress condition. It was shown that the crack growth was opening type at shallower regime and at greater depth shear fracture was predicted to occur followed by the transition to open fracture.

Report

(3 results)
  • 1999 Annual Research Report   Final Research Report Summary
  • 1998 Annual Research Report
  • Research Products

    (16 results)

All Other

All Publications (16 results)

  • [Publications] A-M.Wulff,T.Hashida,K.Watanabe and H.Takahashi: "Attenuation behavior of tufaceous sandstone and granite during microfracturing"Geophysical Journal International. Vol.139. 395-409 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Kazushi Sato and Toshiyuki Hashida: "Numerical Simulation of Hydraulic Fracturing in Hot Dry Rock under Supercritical Water Condition-Effect of Tectonic Stress"Proc. World Geothermal Congress 2000,(May 28-June 10, 2000, Kyushu-Tohoku, Japan). in press (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] 橋本健嗣、高橋亨、加藤愛太郎、大中康譽、橋田俊之: "高温・高圧水環境下における花こう岩のせん断破壊挙動に関する研究"日本機械学会 東北学生会学生員卒業研究発表講演会論文集(2000年3月4日、山形大学工学部). in press (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Toshiyuki Hashida,T.Takahashi,Kazushi Sato and Katsuto Nakatsuka: "Fracture Mechanics Study on Formation Process of Artificial Geothermal Reservoirs under Supercritical Water Conditions"Proceedings of 4th International HDR Forum (Strasbourg). in press (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Z.Jng,J.Willis-Richards,K.Watanabe,and T.Hashida: "A New 3-D Stochastic Model for HDR Geothermal Reservoir in Fractured Crystalline Rock"Proceedings of 4th International HDR Forum (Strasbourg). in press (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] A-M. Wulff, T. Hashida, K. Watanabe and H. Takahashi: "Attenuation behavior of tufaceous sandstone and granite during microfracturing"Geophysical Journal International. Vol.309. 395-409 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Kazushi Sato and Toshiyuki Hashida: "Numerical Simulation of Hydraulic Fracturing in Hot Dry Rock under Supercritical Water Condition - Effect of Tectonic Stress"Proc. World Geothermal Congress 2000, (May 28-June 10, 2000, Kyushu-Tohoku, Japan). (in press). (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Kenji Hashimoto, Toru Takahashi, Aitaro Kato, Michiyasu Ohnaka, Toshiyuki Hashida: "Fracture Mechanics Study of Shear Faulting in Granite under High Temperature and Pressurized Water Environment"Proceedings of the 30th Annual Meeting of JSME Tohoku Regional Student Division, (March 4, 2000, Yamagata). (in press). (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Toshiyuki Hashida, T. Takahashi, Kazushi Sato and Katsuto Nakatsuka: "Fracture Mechanics Study on Formation Process of Artificial Geothermal Reservoirs under Supercritical Water Conditions"Proceedings of 4th International HDR Forum (Strasbourg). (in press). (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Z. Jing, J. Willis-Richards, K. Watanabe, and T. Hashida: "A New 3-D Stochastic Model for HDR Geothermal Reservoir in Fractured Crystalline Rock"Proceedings of 4th International HDR Forum (Strasbourg). (in press). (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Kazushi Sato and Toshiyuki Hashida: "Numerical Simulation of Hydraulic Fracturing in Hot Dry Rock under Supercritical Water Condition - Effect of Tectonic Stress"Proc. World Geothermal Congress 2000, (May 28-June 10, 2000, Kyushu-Tohoku, Japan). (in press). (2000)

    • Related Report
      1999 Annual Research Report
  • [Publications] 橋本健嗣、高橋 亨、加藤愛太郎、大中康譽、橋田俊之: "高温・高圧水環境下における花こう岩のせん断破壊挙動に関する研究"日本機械学会 東北学生会学生員卒業研究発表講演会論文集(2000年3月4日、山形大学工学部). (in press). (2000)

    • Related Report
      1999 Annual Research Report
  • [Publications] Toshiyuki Hashida,T.Takahashi,Kazushi Sato and Katsuto Nakatsuka: "Fracture Mechanics Study on Formation Process of Artificial Geothermal Reservoirs under Supercritical Water Conditions"Proceedings of 4th International HDR Forum (Strasbourg). (in press). (2000)

    • Related Report
      1999 Annual Research Report
  • [Publications] Z.Jing,J.Willis-Richards,K.Watanabe and T.Hashida: "A New 3-D Stochastic Model for HDR Geothermal Reservoir in Fractured Crystalline Rock"Proceedings of 4th International HDR Forum (Strasbourg). (in press). (2000)

    • Related Report
      1999 Annual Research Report
  • [Publications] Toshiyuki Hashida, T.Takahashi, Kazushi Sato and Katsuto Nakatsuka: "Fracture Mechanics Study on Formation Process of Artificial Geothemal Reservoirs under Supercritical Water Conditions" Proceedings of 4th International HDR Forum (Strasbourg). in press. (1999)

    • Related Report
      1998 Annual Research Report
  • [Publications] Z.Jing, J.Willis-Richards, K.Watanabe, and T.Hashida: "A New 3-D Stochastic Model for HDR Geothermal Reservoir in Fractured Crystalline Rock" Proceedings of 4th Internatinal HDR Forum (Strasbourg). (in press). (1999)

    • Related Report
      1998 Annual Research Report

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Published: 1998-04-01   Modified: 2016-04-21  

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