Numerical simulation of dynamic response of dry granular flow impacting rigid retaining wall
[Objective]Rigid barrier structures are an engineering measure used to reduce the disaster intensity of landslide dry debris flows.In order to investigate the dynamic response of dry debris flow impact on rigid barrier structures under different in-clination angles of flow path and volumes of dry debris flow,[Methods]this study developed clump particles using the Fish lan-guage and conducted a three-dimensional discrete element numerical simulation study(PFC3D)based on indoor flume test result to explore the dynamic characteristics of landslide impact,impact force,accumulation morphology,and energy evolution process.[Results]The energy evolution process and impact force-time curve result show that throughout the entire landslide process,fric-tional energy accounts for approximately 80%of the total energy consumption;for slope angles of 35°,40°,45°(H=15 cm),the ratio of peak impact force to accumulation force increases(1.064,1.380,1.538)with the increase of slope angle.[Conclusion]The simulation result indicate that clump-shaped particles can effectively simulate the shape effect of particles,pro-viding a reference for the discrete element simulation of dry debris flow impact dynamics.Frictional energy dissipation is the main form of energy consumption,when dry debris flow occurs,Increasing slope angle accelerates the landslide sliding process,in-creases peak kinetic energy,and forms larger peak impact force and accumulation force;increasing the volume of dry debris flow increases the effect of slope angle on the movement capability of dry debris flow,Resulting in a significant increase in the length of accumulation on the slope and barrier structure.
landslidesdry debris flowbarrier structurediscrete element methodnumerical simulationimpact dynamics
万方数据
维普
