Abstract:In order to study the failure mechanism and impact intensityof single soil landslide Taking Jin quansi landslide in Mian County as the research object, the mesoscopic parameters of rock and soil mass of the landslide were obtained by biaxial test calibration method, and the results were compared with the results of indoor mechanical test of rock and soil mass. It is considered that the calibrated meso-parameters can be applied to the model of Jin quansi landslide. Then, based on the discrete element method of particle flow, the landslide numerical model is constructed to simulate the deformation and failure process of the landslide, and the impact intensity of the single landslide is characterized by three indexes: the impact distance, the velocity and the impact force. The results show that the slope foot and rear edge of Jin quansi landslide deform first, and then the whole slope appears as a compound failure characteristic of pulling forward and pushing back after the middle locking section of the slope is penetrated. The impact distance of landslide is 23.82 m, the maximum impact velocity is 4.10 m / s, the impact force decreases linearly with the increase of impact distance, and the maximum impact force per unit width is 205 kN. The particle flow discrete element method is effective in simulating the progressive failure process of a landslide, and it is also suitable for quantitative analysis of the impact strength of a single landslide.