MPM Simulation Study Of Large Landslide Deformation On The Accumulation Body Considering Particle Crushing Effect Of Shear Zone

High-speed and long-distance landslides often lead to catastrophic consequences,and have always been a key research object in the geotechnical engineering community.Many scholars have studied the deformation process,formation mechanism and influence range of high-speed and long-distance landslides.However,the dynamic process of largedeformation landslides usually involves a series of complex problems such as particle crushing and pore water pressure.Pore water pressure has an important influence on the initiation and movement of landslides.It is difficult for traditional numerical calculation methods to consider such problems,while the material point method(MPM)has unparalleled advantages in solving large deformation situation(such as high-speed longdistance landslides).In view of this,based on the mathematical model of the pore water pressure change caused by particle crushing on the sliding surface,this paper combined with the traditional material point method(MPM)algorithm,the material point method algorithm for coupled pore water pressure is derived,and carries out the numerical simulation study of the landslide movement process.The main work and final results of this paper are as follows:(1)This article introduces related engineering phenomena,laboratory tests and numerical simulation studies related to soil particle crushing.These studies indicate that the material on the sliding surface on the sliding surface has obvious particle crushing during the shearing process,which causes the pore water pressure of the sliding surface to rise,is one of the reasons for the occurrence of high-speed and long-distance landslides.(2)The mathematical model considering the pore water pressure formula caused by particle crushing on the sliding surface is introduced into the material point method(MPM),The corresponding algorithm flow is given and the program of the coupled material point method considering the pore water pressure caused by particle crushing is compiled.(3)The MPM method is used to simulate a simple slope example,and the failure movement process of the landslide is analyzed in detail,which verifies the effectiveness and accuracy of the method.On this basis,the coupled MPM method is used to simulate a simple slope example,and the movement law of the simple slope considering the pore water pressure caused by particle crushing and its influence on the accumulation form after sliding are analyzed;(4)Using the coupled MPM program to simulate the failure motion process of the landslide in the Shenzhen landslide,The effect of rising pore water pressure caused by particle crushing on the sliding surface on the scope of failure and deformation of the Shenzhen landslide,the shape of the sliding surface,the sliding distance of the sliding body,and the shape of accumulation.