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Volume 38 Issue 5
Sep 2024
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Chinese Journal of High Pressure Physics  > 2024  >  38(5): 054203.
XU Yang, ZHOU Zonghong, YANG Yuan, LIANG Yuangui, LI Shaobin. Study on Failure Mode and Energy Evolution of Fractured Rock Body under Triaxial Compression[J]. Chinese Journal of High Pressure Physics, 2024, 38(5): 054203. doi: 10.11858/gywlxb.20240722
Citation: XU Yang, ZHOU Zonghong, YANG Yuan, LIANG Yuangui, LI Shaobin. Study on Failure Mode and Energy Evolution of Fractured Rock Body under Triaxial Compression[J]. Chinese Journal of High Pressure Physics, 2024, 38(5): 054203. doi: 10.11858/gywlxb.20240722
shu

Study on Failure Mode and Energy Evolution of Fractured Rock Body under Triaxial Compression

doi: 10.11858/gywlxb.20240722
  • 1.

    Faculty of Public Safety and Emergency Management, Kunming University of Science and Technology, Kunming 650093, Yunnan, China

  • 2.

    Faculty of Land Resources Engineering, Kunming University of Science and Technology, Kunming 650093, Yunnan, China

  • 3.

    Heqing Beiya Mining Co., Ltd., Dali 671507, Yunnan, China

  • Received Date: 31 Jan 2024
  • Rev Recd Date: 21 Mar 2024
  • Accepted Date: 27 May 2024
    • Available Online: 22 Jul 2024
  • Issue Publish Date: 05 Oct 2024
    Abstract
  • To study the crack extension characteristics and energy evolution law of the rock body with different lengths of single fissure under different confining pressures, the mesoscopic parameters were calibrated by use of the indoor triaxial compression test, and the numerical simulation test of PFC2D particle flow was carried out. The results show that tensile cracks are generated before shear cracks, and both of them grow exponentially; the decrease of the fissure length and the increase of the confining pressure restrain the rapid growth of tensile and shear cracks; when the final failure occurs, the tensile and shear cracks decrease with the increase of the fissure length. The stress is concentrated at both ends of the crack, and there is stress concentration around the crack. Under the same confining pressure, the number of failure blocks of the rock sample decreases with the increment of fissure length. The nature of rock failure is the process of energy storage, dissipation and release, and the rock energy transformation is divided into four stages during the loading process. The increase in fissure length weakens the ability of the rock samples to store strain energy, the total energy decreases, and the confining pressure enhances the ability of the rock samples to store strain energy. The dissipated energy is greater than the strain energy when the rock sample fails, and the dissipated energy decreases with the fissure growth.

     

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