Dynamic Compaction of Granular Soils

本研究计画系针对影响粗粒土强夯效率之参数进行系统之研究。实验阶段将包括大规模的实验室测试，动态测量土壤压力和冲击过程中的夯实加速度，以及静态测量每次夯实下降后土体内的应变。这些测量是必要的或动态土夯相互作用的分析。分析阶段将包括开发一个动态模型，用于分析冲击荷载下的土壤特性。此外，还将使用一个有限元计算机代码，该代码采用了土的动态弹粘塑性大应变本构模型。将实验室和现场测试结果与分析模型和有限元分析结果进行比较。本研究的最终目标是对强夯机理的基本认识和合理的工程设计准则的发展。

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.