基于物质点法的白格滑坡堰塞坝形成过程数值模拟OA北大核心CSTPCD

In recent years,frequent seismic activities and extreme weather conditions have induced numerous landslide barrier dams,posing a severe threat to the lives,property,and infrastructure of river basins.In this paper,a friction coefficient model de-pendent on sliding velocity was introduced into the material point method to solve the sliding surface contact algorithm.The im-proved method's reliability was validated by comparing it with experimental results.Based on this,the inverse analysis for the for-mation process of the Baige landslide barrier dam was carried out,and the influence of sliding bed friction on the damming mode of the landslide dam was discussed.The research results indicated that the formation process of the Baige barrier dam can be di-vided into three stages:accelerated movement,braking in valley,and dam accumulation of the landslide mass.The maximum ve-locity of the Baige landslide reached 45 m/s,with the highest velocity located at the rear of the landslide mass.The front of the landslide mass was influenced by bed friction,resulting in unstable velocity and significant fluctuations,and a 20-second earlier stoppage compared to the landslide mass's rear.Different contact models for the sliding surface determine the final damming state of the landslide.Simulating with a friction coefficient model dependent on sliding velocity accurately reflects the accumulation state of the Baige landslide dam.While using the peak friction coefficient of the sliding surface,the movement distance of the Baige landslide reduced by32%,and it prevents the complete blockage of the Jinsha River by the dam.While calculating with the residual friction coefficient,the movement distance increased by12%.The research findings are of significant importance in deep-ening our understanding of the damming mode of landslide dams.They provide valuable references for disaster prediction,mitiga-tion,emergency response,and geological disposal in landslide dam chain disasters.