Dynamic Behavior of Saturated Soil Under Buried Explosive Loading

Abstract

AbstractSoil failure under buried explosives detonation and evolution of pore water and air pressures, as well as temperature and deformation increments, are investigated by a set of coupled multiphysics balance equations implemented via Material Point Method (MPM) in Uintah (open-source massively parallel codes). Fluid–structure and fluid–solid interactions are simulated by coupling MPM to a finite-volume, cell-centered, multi-material compressible CFD formulation (Implicit, Continuous fluid, Eulerian: ICE) including the transformation of the High-Explosive (HE) solid into highly pressurized gaseous products. Blast waves in the soil are simulated by Jones-Wilkins-Lee (JWL++) detonation model of HE material. The dynamic compacting of partially saturated soil or sediment in the neighborhood of a concentrated explosive source is studied via implementing a plastic gas continuum model. This approach also includes modeling of detonation waves transition from the high pressure plastic gas zone to the moderate pressure elastic–plastic zone. In addition to the governing equations for wave propagation (originated with the explosion), the non-linear coupled macroscopic momentum/mass balance for both the solid matrix and the fluid phase in a saturated porous medium are solved numerically in low-moderate pressure zone.KeywordsExplosive loadingSoilMPMMultiphaseDetonation