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PFC/FLAC coupled simulation of dynamic compaction in granular soils

机译：PFC / FLAC耦合模拟粒状土壤中的压实

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This paper presents the PFC/FLAC coupled method to simultaneously reveal the macro- and micro-mechanisms of granular soils during dynamic compaction. A good agreement was found between the numerical simulation and model test. By analyzing the soil displacement field, motion of tracer particles, and evolution of local porosity, the dynamic densification process of granular soils was reproduced. The results show that soil deformations under dynamic compaction can be divided into two modes: the punching deformation caused by the wedging effect of a conical core based on the bearing capacity mechanism, and the compaction deformation induced by the propagation of dynamic waves based on the densification mechanism. The dynamic compaction process is composed of two phases: compaction because of the transient impact and compaction because of the vibration of soil particles.
机译：本文提出了PFC / FLAC耦合方法，以同时揭示动态压实过程中粒状土壤的宏观和微观机制。在数值模拟和模型测试之间找到了很好的协议。通过分析土壤位移场，示踪剂颗粒的运动以及局部孔隙的演化，再现了颗粒状土壤的动态致密化过程。结果表明，动力压实作用下的土体变形可分为两种模式：基于承载力机理的圆锥形芯体楔入作用引起的冲孔变形；基于致密化作用的动波传播引起的压实变形。机制。动态压实过程包括两个阶段：由于瞬时冲击而引起的压实和由于土壤颗粒的振动而引起的压实。

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