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To address the challenges of poor fragmentation efficiency and high block ratio in deep jointed rock mass blasting operations, a comprehensive investigation was conducted to examine the blasting damage mechanisms under biaxial isobaric conditions. The RHT constitutive model parameters were theoretically calibrated, and numerical simulations were performed using ANSYS/LS-DYNA to analyze rock damage and fracture propagation under biaxial geostresses ranging from 0 to 50 MPa. The simulation results revealed three key findings: (1) Increasing confining pressure significantly reduced the maximum circumferential crack length, wing crack extension, and fracture zone area; (2) Joint structures effectively inhibited crack propagation on the back-blast side while intensifying damage on the face-blast side, with geostress further exacerbating this damage pattern; (3) The attenuation rate of peak effective stress at joint tips decreased progressively with higher confining pressures, indicating a diminishing influence of joints on stress wave propagation.

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Study on Blasting Damage and Crack Extension of Jointed Rock Mass Under Bi-Directional Isobaric Pressure

  • 会议论文

  • 发表日期：

    2026年

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  • Xuanrong Zheng,
  • Kai Ren,
  • Rui Liu,
  • Xueru Yue,
  • Shuailiang Li

摘要

To address the challenges of poor fragmentation efficiency and high block ratio in deep jointed rock mass blasting operations, a comprehensive investigation was conducted to examine the blasting damage mechanisms under biaxial isobaric conditions. The RHT constitutive model parameters were theoretically calibrated, and numerical simulations were performed using ANSYS/LS-DYNA to analyze rock damage and fracture propagation under biaxial geostresses ranging from 0 to 50 MPa. The simulation results revealed three key findings: (1) Increasing confining pressure significantly reduced the maximum circumferential crack length, wing crack extension, and fracture zone area; (2) Joint structures effectively inhibited crack propagation on the back-blast side while intensifying damage on the face-blast side, with geostress further exacerbating this damage pattern; (3) The attenuation rate of peak effective stress at joint tips decreased progressively with higher confining pressures, indicating a diminishing influence of joints on stress wave propagation.