A comparative study of elastoplasticity and non-Newtonian fluid constitutive models simulated by the material point method for soil granular flow problems
The flow of soil particles is a typical large deformation failure and has the flow characteristics of a non-Newtonian fluid.Accurately simulating the flow and impact process of soil particles is of great significance to the prevention and control of geological disasters such as landslide and debris flow.Material point method(MPM)is a kind of meshless particle method which has been widely used in various large deformation problems.In the past,the elastoplastic constitutive model is usually used to simulate the flow of soil particles,but there is not much analysis of the non-Newtonian constitutive model.In this paper,the non-Newtonian constitutive model is introduced to provide a new method and idea for soil particle flow simulation.In the simulation,generalized Cross non-Newtonian model 3 d material point method is used,with an artificial damping force representing the friction between the particles,to simulate the collapse of the soil particles,sliding along the slope,and hitting obstacles,and to study its movement process.The simulation results of the elastic-plastic constitutive model are compared for verification.The results show that the material point method based on the non-Newtonian fluid constitutive model can well simulate the whole process of soil particles acceleration,deceleration and stabilization and their impact on obstacles.
material point method(MPM)non-Newtonian fluidCross modelgranular flowElastoplastic constitutive model
万方数据
维普
