DEM-SPH Simulation Of Saturated Granular Materials With Effect Of Hydrostatic Compressibility Of Particles

Based on the existing discrete particle assembly-effective fluid continuum model for modeling the coupled hydro-mechanical behavior in saturated granular materials, the effects of volumetric deformation of solid grains due to pore water pressure on coupled hydro-mechanical behaviors are integrated into the model, and a novel discrete particle assembly-effective fluid continuum model considering particle’s hydrostatic compressibility is developed. In this paper the deformed solid phase is modeled as packed assemblages of interacting discrete particles using the discrete element method (DEM), while the characteristic-based smoothed particle hydrodynamics method (CB-SPH) is used for the numerical solution of the averaged incompressible Navier-Stokes equations governing the pore fluid flow. The meso-structured based Voronoi cell effective continuum model is introduced to define the meso-mechanically informed Cauchy stresses and Biot effective Cauchy stresses in saturated granular materials. Numerical results of saturated granular panel example demonstrate the influences of volumetric deformation of solid grains due to pore water pressure on the carrying capacity, the deformation and distributions of both effective stress and pore water pressure of the saturated granular panel.