Failure Mechanism of Locked Slopes Under Seismic Loading Based on PFC2D

Abstract

Due to the difficulty of accurately characterizing the discontinuous characteristics of the failure process of locked slopes using traditional continuous medium methods, and systematic analysis of slopes with geological locked structures is still insufficient. Therefore, this paper is based on the discrete element numerical simulation method, and this article simulates the deformation, crack propagation, and failure process of slopes under seismic waves, and studies the failure mechanism of locked slopes under seismic loads. Analyzed the velocity field, acceleration field, and crack propagation law of slopes under different frequencies and amplitudes. The research results indicate that the locked segment plays a key role in slope stability, and the rupture first starts from the locked segment (especially the lower end of the locked segment) and gradually extends to the slope surface, significantly affecting the failure mode and dynamic response of the slope; The larger the amplitude of earthquake load, the greater the range and severity of slope rupture; The frequency of seismic loads is generally negatively correlated with slope failure and dynamic response, with sudden changes occurring only when seismic waves resonate with the slope.