A fully coupled hydro-mechanical material point method for saturated dense granular materials

摘要: Abstract The stability of a dense granular assembly can be greatly reduced by pore pressure the interstitial fluid, and body may fail transit from solid-like state to fluid-like state. This process involves two major problems: large deformation hydro-mechanical coupling. In this work, three-dimensional fully coupled model using material point method (MPM) is developed. Darcy's law, considering inertial effect, adopted govern motion water, conservation momentum mixture used solid, i.e., materials. spatial discretization schemes for these equations are derived generalized integration (GIMP), proposed MPM formulation implemented in numerical code. developed first quantitatively validated comparing simulation results temporal evolution distribution hydraulic one-dimensional oedometer test with analytical results. An experiment designed observe failure saturated sand pile, which partial-saturated region avoided increasing head at input boundary, kinetic energy water dissipated filtering cloth. simulated It found that location shear band agrees sliding surface experiment. evolutions distributions solid velocity specific time given provide insight into mechanism process. work would helpful understanding initiation debris flows induced rainfall, production gas hydrate-bearing sediments due fluid content associated hydrate dissociation.