Abstract:In this paper, the downhill jointed rock slope strengthened by anti slide pile is taken as the research object, and the numerical calculation model of slope is established by particle flow analysis software PFC2D. The failure mode of slope in the natural state and the deformation characteristics after reinforcement are analyzed. Through inputting the real seismic wave, the dynamic response and failure mode of downhill jointed rock slope and anti slide pile under earthquake are systematically studied. The results show that the failure mode of the rock slope with inclined joints in the natural state belongs to the leading edge traction type and the trailing edge vertical tensile crack. The internal tensile shear combination failure of the landslide slides along the direction of the inclined joints, which is consistent with the actual situation; The anti slide pile can reduce the adverse effect of the structural plane and maintain the overall stability of the slope; Under the action of earthquake load, the anti slide pile can ensure that the slope will not be damaged on a large scale, and reduce the adverse impact of the structure on the slope failure mode. The slope safety factor under different working conditions is discussed This study is of great significance to the prediction of earthquake induced landslide risk and reinforcement design.