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Study on the Accuracy of Fracture Criteria in Predicting Fracture Characteristics of Granite with Different Occurrence Depths

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  • Chenbo Liu

    (College of Water Resource & Hydropower, Sichuan University, Chengdu 610065, China)

  • Gan Feng

    (College of Water Resource & Hydropower, Sichuan University, Chengdu 610065, China
    Ministry of Education, Key Laboratory of Deep Earth Science and Engineering, Sichuan University, Chengdu 610065, China)

  • Hongqiang Xie

    (College of Water Resource & Hydropower, Sichuan University, Chengdu 610065, China)

  • Jilan Wang

    (College of Water Resource & Hydropower, Sichuan University, Chengdu 610065, China)

  • Zhipan Duan

    (College of Water Resource & Hydropower, Sichuan University, Chengdu 610065, China)

  • Ye Tao

    (College of Water Resource & Hydropower, Sichuan University, Chengdu 610065, China)

  • Gongda Lu

    (College of Water Resource & Hydropower, Sichuan University, Chengdu 610065, China)

  • Huining Xu

    (College of Water Resource & Hydropower, Sichuan University, Chengdu 610065, China)

  • Yaoqing Hu

    (College of Mining Engineering, Taiyuan University of Technology, Taiyuan 030024, China)

  • Chun Li

    (College of Mining Engineering, Taiyuan University of Technology, Taiyuan 030024, China)

  • Yuefei Hu

    (College of Mining Engineering, Taiyuan University of Technology, Taiyuan 030024, China)

  • Qiuhong Wu

    (Work Safety Key Lab on Prevention and Control of Gas and Roof Disasters for Southern Coal Mines, Hunan University of Science and Technology, Xiangtan 411201, China)

  • Lu Chen

    (School of Civil Engineering, Changsha University of Science & Technology, Changsha 410000, China)

Abstract

The fracture network of a deep geothermal reservoir forms the place for heat exchange between injected fluid and rock mass with high temperature. The fracture resistance ability of reservoir rocks will affect the formation of fracture-network structure, heat exchange and transmission characteristics, and reservoir mechanical stability. However, there are few reports on the fracture toughness and trajectory prediction of geothermal reservoirs with different depths. In this paper, the modified maximum tangential stress criterion (MMTS) is analyzed. The results show that the experimental data are significantly different from the theoretical estimate of MMTS under the influence of different occurrence depths. It is found that the fracture process zone (FPZ) seriously affects the accuracy of predicting fracture initiation angle and mixed-mode (I+II) fracture toughness by MMTS. The FPZ value, considering the influence of different occurrence depths, is modified, and the accuracy of MMTS in predicting the fracture mechanical characteristics of granite is improved. In addition, the mechanical test results show that the Brazilian splitting strength ( σ t ) of granite fluctuates increase with the increase in temperature. With the increase in deviatoric stress, the Brazilian splitting strength and the Brazilian splitting modulus of rock show a trend of first increasing, then decreasing, and then increasing.

Suggested Citation

  • Chenbo Liu & Gan Feng & Hongqiang Xie & Jilan Wang & Zhipan Duan & Ye Tao & Gongda Lu & Huining Xu & Yaoqing Hu & Chun Li & Yuefei Hu & Qiuhong Wu & Lu Chen, 2022. "Study on the Accuracy of Fracture Criteria in Predicting Fracture Characteristics of Granite with Different Occurrence Depths," Energies, MDPI, vol. 15(23), pages 1-17, December.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:23:p:9248-:d:995167
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    References listed on IDEAS

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    1. Liu, Bailong & Suzuki, Anna & Watanabe, Noriaki & Ishibashi, Takuya & Sakaguchi, Kiyotoshi & Ito, Takatoshi, 2022. "Fracturing of granite rock with supercritical water for superhot geothermal resources," Renewable Energy, Elsevier, vol. 184(C), pages 56-67.
    2. Lu, Shyi-Min, 2018. "A global review of enhanced geothermal system (EGS)," Renewable and Sustainable Energy Reviews, Elsevier, vol. 81(P2), pages 2902-2921.
    3. Zhou, Zhou & Jin, Yan & Zeng, Yijin & Zhang, Xudong & Zhou, Jian & Zhuang, Li & Xin, Shunyuan, 2020. "Investigation on fracture creation in hot dry rock geothermal formations of China during hydraulic fracturing," Renewable Energy, Elsevier, vol. 153(C), pages 301-313.
    4. Zhu, Jialing & Hu, Kaiyong & Lu, Xinli & Huang, Xiaoxue & Liu, Ketao & Wu, Xiujie, 2015. "A review of geothermal energy resources, development, and applications in China: Current status and prospects," Energy, Elsevier, vol. 93(P1), pages 466-483.
    5. Sun, Zhi-xue & Zhang, Xu & Xu, Yi & Yao, Jun & Wang, Hao-xuan & Lv, Shuhuan & Sun, Zhi-lei & Huang, Yong & Cai, Ming-yu & Huang, Xiaoxue, 2017. "Numerical simulation of the heat extraction in EGS with thermal-hydraulic-mechanical coupling method based on discrete fractures model," Energy, Elsevier, vol. 120(C), pages 20-33.
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    Cited by:

    1. Shaoqi Kong & Gan Feng & Yueliang Liu & Chuang Wen, 2023. "Energy Extraction and Processing Science," Energies, MDPI, vol. 16(14), pages 1-5, July.
    2. Jizhe Guo & Zengchao Feng & Xuecheng Li, 2023. "Shear Strength and Energy Evolution of Granite under Real-Time Temperature," Sustainability, MDPI, vol. 15(11), pages 1-18, May.
    3. Jun Liu & Gan Feng & Peng Zhao, 2023. "Application and Optimization of CCUS Technology in Shale Gas Production and Storage," Energies, MDPI, vol. 16(14), pages 1-3, July.

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