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Shear Strength and Energy Evolution of Granite under Real-Time Temperature

Author

Listed:
  • Jizhe Guo

    (Key Laboratory of In-Situ Property Improving Mining of Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, China)

  • Zengchao Feng

    (Key Laboratory of In-Situ Property Improving Mining of Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, China)

  • Xuecheng Li

    (Key Laboratory of In-Situ Property Improving Mining of Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, China)

Abstract

The shear mechanical properties of rock under high temperature and high pressure are key issues in geothermal energy development. In order to explore the variation in shear mechanical properties of rock under high temperature and high pressure, the shear experiments of granite under real-time temperatures and normal stresses were carried out using the servo-controlled true triaxial experimental system for rock shearing testing and acoustic emission technology. The results show the following trends: (1) the peak shear strength of granite increases slightly first and then decreases sharply with real-time temperature, with 200 °C considered as the threshold temperature for the peak shear strength of granite. When the temperature is constant, the shear strength of granite increases linearly with the increase in normal stress. (2) Before 200 °C, the shear modulus of granite decreases slowly with the increase in temperature and decreases rapidly after 200 °C. The shear modulus always increases linearly with the increase in normal stress. (3) Under the coupling effect of real-time high temperature and normal stress, the cumulative acoustic emission energy released during the shear deformation of granite gradually decreases with temperature, and the main failure mode of granite gradually changes from tensile failure to shear failure.

Suggested Citation

  • 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.
    • Handle: RePEc:gam:jsusta:v:15:y:2023:i:11:p:8471-:d:1153684
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    References listed on IDEAS

    as
    1. Lu, Shyi-Min, 2018. "A global review of enhanced geothermal system (EGS)," Renewable and Sustainable Energy Reviews, Elsevier, vol. 81(P2), pages 2902-2921.
    2. Cheng Cheng & Nengxiong Xu & Bo Zheng, 2019. "Mobilized Mohr-Coulomb and Hoek-Brown Strength Parameters during Failure of Granite in Alxa Area in China for High-Level Radioactive Waste Disposal," Energies, MDPI, vol. 12(22), pages 1-16, November.
    3. 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.
    4. Yan-Jun Shen & Xin Hou & Jiang-Qiang Yuan & Chun-Hu Zhao, 2019. "Experimental Study on Temperature Change and Crack Expansion of High Temperature Granite under Different Cooling Shock Treatments," Energies, MDPI, vol. 12(11), pages 1-17, May.
    5. Peng Xiao & Jun Zheng & Bin Dou & Hong Tian & Guodong Cui & Muhammad Kashif, 2021. "Mechanical Behaviors of Granite after Thermal Shock with Different Cooling Rates," Energies, MDPI, vol. 14(13), pages 1-17, June.
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