Abstract This paper presents the FEM-SPH coupling method for the analysis of large deformation problems caused by dynamic compaction (DC). A 3D FEM-SPH coupling model was established in LS-DYNA to simulate the dynamic compaction process. Moreover, DC operation was also simulated separately by the traditional FEM and pure SPH in the same condition with that by the FEM-SPH coupling method. After comparing the results obtained from three simulations with data measured in field test, it was found that the FEM-SPH coupling model can be a useful tool with higher efficiency and accuracy for analysis of the large deformation problem in DC. Then the parametric analyses were performed in the proposed model to evaluate their influences on the effectiveness of compaction for ground soils. The results indicate that the splash of particle soil under impact can be diminished when a fillet treatment is made for the bottom of hammer. With a given tamping energy, DC conducted from a lower distance with a heavier hammer will bring a better effect to the reinforcement of soils. The penetration of the hammer increases with the increase of tamping energy, and the proposed method can deal with DC problem even if the tamping energy is extremely high.

中文翻译：

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FEM-SPH耦合法强夯数值分析

摘要 本文提出了FEM-SPH 耦合方法，用于分析强夯（DC）引起的大变形问题。在LS-DYNA中建立了3D FEM-SPH耦合模型来模拟强夯过程。此外，在与FEM-SPH耦合方法相同的条件下，还分别通过传统FEM和纯SPH模拟了DC操作。将三个模拟获得的结果与现场试验测量的数据进行比较后，发现 FEM-SPH 耦合模型可以成为分析 DC 大变形问题的有效工具，具有更高的效率和准确性。然后在所提出的模型中进行参数分析，以评估它们对地面土壤压实有效性的影响。结果表明，对锤底进行圆角处理可以减少冲击作用下颗粒土的飞溅。在给定的夯实能量下，用较重的锤子从较低距离传导的直流电会对土壤的加固产生更好的效果。锤子的穿透力随着夯实能量的增加而增加，即使夯实能量极高，所提出的方法也能解决直流问题。