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<p>Stress wave propagation to the ground surface undergoes amplification and attenuation effects due to the complex surface topography. However, current research tends to analyze the influencing factors, with limited attention paid to the mechanical mechanisms behind these topographic effects. This study aims to investigate the mechanical mechanism of underground explosion-induced wave propagation in rock medium under different topographies from a particle scale and force chain perspective. The discrete element method (DEM) was employed and developed to capture the wave propagation and reflection behavior. The explosive source set in DEM models was equated to the velocity–time history applied to the cavity wall particles based on the calculation of Autodyn. The validity and reasonableness of the adopted modeling and simulation methods in this study are confirmed. Three representative rock mass topographies were generated in the present study: A semicircular hill, a semicircular hollow, and a flat surface. From the simulation results, the ground motion amplification phenomenon is found on the surface of hill topography and the ground surface adjacent to the hollow topography during the underground explosion processes. Besides, the ground motion attenuation phenomenon is found on the surface of hollows and the corners of the edge of hills and hollows. The wave conversion phenomenon of P-wave reflection was observed in the DEM simulations from the velocity and force-chain fields. Meanwhile, the mechanical mechanism of topographic effects in the rock medium was discussed by the spatial distribution and evolution of the mean compressive and tensile forces of the force chain. Besides, the difference in mean tensile force and energy storage and dissipation between these three topographies during the wave propagation and reflection process was analyzed. This work provides a reference for the discrete medium approach to modeling and capturing explosion-induced wave propagation behavior. Simulation results are beneficial for further understanding the mechanical mechanism of amplification and attenuation effects during wave propagation in different rock mass topographies.</p>

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Mechanical Mechanism of Amplification and Attenuation Effects on the Underground Explosion-Induced Wave Propagated in Hills and Hollows Rock Masses Topographies: Insights from DEM Modeling

  • 期刊论文

  • 发表日期：

    2026年4月8日

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  • Shengtao Yang,
  • Chunhai Li,
  • Yeqing Chen,
  • Mengnan Dai,
  • Gang Deng,
  • Renpeng Chen

摘要

Stress wave propagation to the ground surface undergoes amplification and attenuation effects due to the complex surface topography. However, current research tends to analyze the influencing factors, with limited attention paid to the mechanical mechanisms behind these topographic effects. This study aims to investigate the mechanical mechanism of underground explosion-induced wave propagation in rock medium under different topographies from a particle scale and force chain perspective. The discrete element method (DEM) was employed and developed to capture the wave propagation and reflection behavior. The explosive source set in DEM models was equated to the velocity–time history applied to the cavity wall particles based on the calculation of Autodyn. The validity and reasonableness of the adopted modeling and simulation methods in this study are confirmed. Three representative rock mass topographies were generated in the present study: A semicircular hill, a semicircular hollow, and a flat surface. From the simulation results, the ground motion amplification phenomenon is found on the surface of hill topography and the ground surface adjacent to the hollow topography during the underground explosion processes. Besides, the ground motion attenuation phenomenon is found on the surface of hollows and the corners of the edge of hills and hollows. The wave conversion phenomenon of P-wave reflection was observed in the DEM simulations from the velocity and force-chain fields. Meanwhile, the mechanical mechanism of topographic effects in the rock medium was discussed by the spatial distribution and evolution of the mean compressive and tensile forces of the force chain. Besides, the difference in mean tensile force and energy storage and dissipation between these three topographies during the wave propagation and reflection process was analyzed. This work provides a reference for the discrete medium approach to modeling and capturing explosion-induced wave propagation behavior. Simulation results are beneficial for further understanding the mechanical mechanism of amplification and attenuation effects during wave propagation in different rock mass topographies.