摘要：With the significant changes of the global climate environment,the probability of environmental geological disasters is greatly increased,and the difficulty of prevention is also increasing.This paper presents a study on the numerical simulation of wet granular deposit avalanches,including sliding velocity,runout distance,decomposition,interactions,and collision force to the plate structures.A JKR (Johnson-Kendall-Roberts) - cohesion model based on the discrete element method was derived analytically to simulate the dynamic behaviors of wet granular avalanches on the inclined chute.The results show that the wet granular deposition with low surface energy could be disintegrated into fragmentation and debris during the motion process,and also formed longer runout distance and extensive deposits than that of large surface energy.Furthermore,the average velocity and contact number of wet granular avalanches change with time in the opposite direction,and the maximum velocity corresponds to the minimum number of contact exactly.Moreover,with the increase of surface energy,the cohesion between particles becomes stronger,which lead to the structure of wet-grained avalanches with a large surface energy (y = 500J/m2) could remain initial state until hits the horizontal plane,and then disintegrated into granular clusters.These results also suggest that dense wet granular flow often involves many collisions and lead to a large amount of kinetic energy dissipation.This study can provide some reference for the effective prevention of geological disasters related technology research,so as to improve the effect of environmental geological disasters.
关键词：Environmental geological disaster;Wet granular avalanches;Discrete element method;Surface energy;Numerical simulation
