Research on Impacting Vibration Response Based on Discrete Element

Abstract

Ground vibration is a crucial foundation for the study of blasting demolition and rock-soil failure. In this paper, a soil-layer coupling model is established using the discrete element method (PFC3D), which takes distribution of microscale features into account. Subsequently, based on the Mindlin solution in an elastic half-space subjected to concentrated forces, the difference between the theoretical and numerical solutions is validated, and this study further investigates the laws on impacting vibration responses. The results reveal that, under the impact action of falling hammer, the vibration velocity of soil particle approximates a triangular function over time. The vertical stress exhibits a distribution pattern of increasing initially with soil depth and then decreasing. The contact force chains disperse in a ‘root-like’ manner, leading to a tendency for shear failure in the soil. Actually, impact vibration is a process of accelerated energy conversion, with the majority of impact energy dissipated by various forms of damping. This method can provide a theoretical basis for the stability analysis of ground vibration and disaster prediction.