Material Point Method-Based Simulation of Dynamic Process of Soil Landslides Considering Pore Fluid Pressure

In this study, the dynamic process of soil landslides is investigated using the material point method (MPM). A basal friction algorithm is developed based on the MPM, and the pore water pressure is considered for calculating the basal friction. A large-scale debris flow experiment is performed to validate the effectiveness of the MPM in simulating the dynamic process of soil landslides. The calculated depths of the debris flow using the MPM are consistent with the experimental results. The effects of the basal friction angle and internal friction angle on the debris flow depths are discussed. Moreover, a landslide case is simulated using the MPM, and the calculation results are consistent with the measured results. The horizontal velocity, vertical velocity, velocity direction, and kinetic energy of the landslide are analyzed. Finally, a case involving a different slope near a landslide is evaluated using the MPM. The distributions of velocity in different directions and changes in the average velocity, kinetic energy, and sliding distance are analyzed. By setting a retaining wall, the accumulation height of a landslide accumulated at the retaining wall and the normal force on the retaining wall can be estimated.