Dynamic Compaction of Granular Soils

本研究对影响碎石土强夯法效果的参数进行了系统的研究。实验阶段将包括大规模的实验室测试，动态测量撞击过程中的土壤压力和夯击加速度，以及在每次夯击后静态测量土体内的应变。这些测量是分析动态土壤-夯实相互作用的基础。分析阶段将包括开发一个动态模型，用于分析冲击载荷下的土壤行为。此外，还将使用土的动态弹-粘塑性大应变本构模型的有限元计算机程序。将室内和现场试验结果与分析模型和有限元分析结果进行比较。这项研究的最终目的是从根本上了解强夯法的机理，并制定合理的工程设计准则。

This research project conducts a systematic investigation of the parameters affecting the efficiency of dynamic compaction in granular soils. The experimental phase will include large-scale laboratory tests with dynamic measurements of soil pressures and tamper acceleration during impact, and static measurements of strains within the soil mass following each tamper drop. These measurements are essential or the analysis of the dynamic soil-tamper interaction. The analytical phase will include the development of a dynamic model for the analysis of soil behavior under impact loads. In addition, a finite element computer code with dynamic elastic-viscoplastic large strain constitutive model for soils will be used. Laboratory and field test results will be compared with the analytical model and the finite element analysis results. The final goal of this study is the fundamental understanding of the mechanism of dynamic compaction and the development of rational engineering guidelines for design.