Abstract
The aim of this paper is to provide further understanding of the mechanical behavior of soils when subjected to high-pressure and high-rate loadings. To this end, finite-element (FE) analyses of dynamic compaction and penetration events were conducted using the advanced elastic/plastic soil model of Lade (1977) which was extrapolated to large pressures and implemented into the FE framework. To ensure improved accuracy of the results for conditions involving loading/unloading and stress path changes, an implicit integration scheme was adopted. The simulation results for dynamic densification show that the initial precompaction of the material has a strong influence on both the wave speed and the shape of the wave front. As concerns the initiation of penetration, the simulation results indicate that for the same material, the inception and nature of the localization bands are also strongly dependent on the level of precompaction of the target material. Namely, for a low precompaction level, upon impact multiple bands develop whereas for a larger initial precompaction level, a primary localization band develops.
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