Volume 38 Issue 5
Oct.  2024
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Wang Tingjing. Instability Evolution of Single Fracture with Different Dip Angles on Heterogeneous Rock[J]. GEOTECHNICAL ENGINEERING TECHNIQUE, 2024, 38(5): 539-547. doi: 10.3969/j.issn.1007-2993.2024.05.006
Citation: Wang Tingjing. Instability Evolution of Single Fracture with Different Dip Angles on Heterogeneous Rock[J]. GEOTECHNICAL ENGINEERING TECHNIQUE, 2024, 38(5): 539-547. doi: 10.3969/j.issn.1007-2993.2024.05.006
shu

Instability Evolution of Single Fracture with Different Dip Angles on Heterogeneous Rock

doi: 10.3969/j.issn.1007-2993.2024.05.006

  • Zhejiang College of Construction, Hangzhou 311231, Zhejiang, China

  • Received Date: 2023-10-28
  • Accepted Date: 2024-03-11
  • Rev Recd Date: 2023-12-20
    • Available Online: 2024-10-09
  • Publish Date: 2024-10-09
    Abstract
  • Fractures in rock mass have a significant influence on the mechanical behavior, energy evolution and instability failure of rock. To clarify the rock energy evolution and instability failure mechanism of single fracture with different dip angles, based on the particle flow PFC2D method, a numerical model of sandy mudstone with single fracture with different dip angles was established, and the uniaxial compression test of sandy mudstone with single fracture with different dip angles was simulated. The results show that with the increase of single fracture dip angle, the strength and elastic modulus of sandy mudstone decrease first and then increase, and the prefabricated crack will affect the crack initiation position of the fracture surface and accelerate the formation of the fracture surface. The acoustic emission event has a small range of quiet period before the rock sample is destroyed, which can be used as a precursory criterion for rock failure. With the increase of fracture dip angle, the total energy continues to increase, and the elastic energy and dissipation energy show a trend of increasing first and then decreasing. When the dip angle is 30°, the rock sample has the weakest impact tendency, which is beneficial to reduce the risk of rock burst. When the dip angle is 90°, the rock sample has the strongest impact tendency, which is not conducive to the prevention and control of rock burst.

     

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