Process Simulation and Characteristics Analysis of Long Run-out Debris Flow Movement Based on Material Point Method
The purpose is to study the process of long run-out debris flow movement,as well as the changes in velocity,sliding distance,and kinetic energy during the movement,in order to provide reference for the prevention and treatment of debris flow disasters.Based on the material point method,numerical simulation analysis was conducted on the movement process of two long run-out debris flow engineering examples,Taheman and Luanshibao,using them as background.The horizontal and vertical velocity distribution during the Taheman debris flow movement process,the influence of internal friction angle on the movement process,and the impact of the entrainment effect of Luanshibao debris flow on the accumulation form and kinetic energy changes were analyzed and discussed.The simulation results of the final accumulation form of two debris flows are in good agreement with the measured results,verifying the correctness and effectiveness of the numerical simulation results.As the internal friction increases from 18° to 33°,the peak kinetic energy of the Taheman debris flow decreases by 71.4％,and the final potential energy increases by 54.4％.The energy dissipation of the debris flow decreases by 47.8％.In the simulation of Luanshibao debris flow,the velocity distribution shows the laminar distribution of the velocity field.The internal friction angle has a significant impact on the dynamic process of the debris flow.The sliding mass of Luanshibao debris flow has a strong internal shear effect in the high-speed sliding stage,and the entrainment effect has plaved a certain role in blocking the movement of the debris flow.
debris flowmovement processmaterial point methodnumerical simulation
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万方数据
