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Investigating the failure pattern and mechanism of shale is significant for shale gas exploration. Shale specimens with horizontal bedding planes are tested under indirection tensile stress, and a high-speed camera monitor is synchronously conducted for digital image correlation (DIC) calculation. The results show that, the shale specimens may fail at loading points or other weak points, leading to a planar curve on the front surface. Different loading rates and bedding planes contribute to torque and bending moment on the cross-section, resulting in a torsional space fracture surface. Finally, a 3D numerical model was established to reappear the failure morphologies. The fracture mechanics are revealed from the energy conversion perspective. The study can provide some references for the study of the three-dimensional fracture model and mechanism of rock in geotechnical engineering.

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Spatial Fracture Morphologies and Failure Mechanism of Shale Specimens in Three-Points Bending Test

  • 会议论文

  • 发表日期：

    2025年

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  • Yuxin Ban,
  • Qiang Xie,
  • Yucheng Chen,
  • Weichen Sun,
  • Jun Duan,
  • Xiang Fu,
  • Tao Yang,
  • Rini Asnida Abdullah

摘要

Investigating the failure pattern and mechanism of shale is significant for shale gas exploration. Shale specimens with horizontal bedding planes are tested under indirection tensile stress, and a high-speed camera monitor is synchronously conducted for digital image correlation (DIC) calculation. The results show that, the shale specimens may fail at loading points or other weak points, leading to a planar curve on the front surface. Different loading rates and bedding planes contribute to torque and bending moment on the cross-section, resulting in a torsional space fracture surface. Finally, a 3D numerical model was established to reappear the failure morphologies. The fracture mechanics are revealed from the energy conversion perspective. The study can provide some references for the study of the three-dimensional fracture model and mechanism of rock in geotechnical engineering.