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<p>Under strong earthquake loading, the stability of rock slopes situated near seismic faults is influenced by the seismic waves’ incident angle and pre-existing structure’ distribution. In this paper, a dynamic simulation model of rock slopes containing non-persistent pre-existing structure was established using a coupled finite difference–discrete element method (FDM–DEM) to investigate the rock slopes’ dynamic response and failure modes subject to obliquely incident shear waves (SV). A viscoelastic artificial boundary is introduced to enable accurate seismic wave input, allowing for the investigation of how varying incidence angles and pre-existing structure properties influence the dynamic behavior of the slope. The result indicates that tensile failure of rock bridges acts as the main initiating factor for slope instability, ultimately facilitating the development of a large-scale sliding surface once pre-existing structure becomes connected. For different seismic wave incidence angles, the slope exhibits patterns of minor deformation, overall failure, and local failure, with the overall failure occurring at an incident angle of 5–15°. In addition, the pre-existing structure distribution pattern affects internal stress transmission and crack propagation paths within the slope, but the difference in dynamic response among those models is not obvious. This work offers valuable theoretical insights into evaluating the rock slopes’ seismic stability in strong earthquake regions.</p>

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Dynamic Failure Analysis of Rock Slopes with Discontinuous Joints Under Obliquely Incident SV Waves Using a FDM–DEM Coupling Method

  • 期刊论文

  • 发表日期：

    2025年12月24日

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  • Kunsheng Gu,
  • Jian Zhou,
  • Xiao Peng,
  • Fuchu Dai,
  • Hao Liu,
  • Luqing Zhang,
  • Zhenhua Han

摘要

Under strong earthquake loading, the stability of rock slopes situated near seismic faults is influenced by the seismic waves’ incident angle and pre-existing structure’ distribution. In this paper, a dynamic simulation model of rock slopes containing non-persistent pre-existing structure was established using a coupled finite difference–discrete element method (FDM–DEM) to investigate the rock slopes’ dynamic response and failure modes subject to obliquely incident shear waves (SV). A viscoelastic artificial boundary is introduced to enable accurate seismic wave input, allowing for the investigation of how varying incidence angles and pre-existing structure properties influence the dynamic behavior of the slope. The result indicates that tensile failure of rock bridges acts as the main initiating factor for slope instability, ultimately facilitating the development of a large-scale sliding surface once pre-existing structure becomes connected. For different seismic wave incidence angles, the slope exhibits patterns of minor deformation, overall failure, and local failure, with the overall failure occurring at an incident angle of 5–15°. In addition, the pre-existing structure distribution pattern affects internal stress transmission and crack propagation paths within the slope, but the difference in dynamic response among those models is not obvious. This work offers valuable theoretical insights into evaluating the rock slopes’ seismic stability in strong earthquake regions.