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.

本文的目的是进一步了解承受高压和高速载荷时土壤的力学行为。为此，使用 Lade (1977) 的先进弹性/塑性土壤模型对动态压实和穿透事件进行了有限元 (FE) 分析，该模型被外推到大压力并实施到 FE 框架中。为了确保在涉及加载/卸载和应力路径变化的条件下提高结果的准确性，采用了隐式积分方案。动态致密化模拟结果表明，材料的初始预压实对波速和波前形状都有很大影响。关于渗透的开始，模拟结果表明，对于相同的材料，定位带的开始和性质也强烈依赖于目标材料的预压实水平。即，对于低预压实水平，在撞击时会形成多个带，而对于较大的初始预压水平，会形成主要定位带。