强夯加固回填土地基的三维数值模拟

针对回填土地基，基于ABAQUS有限元软件，采用大变形几何非线性三维有限元方法对强夯加固效果进行了数值模拟。分析中考虑每一次夯击引起的塑性变形，确定前次夯击后土体塑性区开展的形状，并调整塑性区的土性参数，以此作为下次夯击分析的基础，重复上述步骤来实现对强夯整个过程的模拟。结合工程实例分析，得到了在不同夯击能、不同夯击次数作用下土体塑性区开展的情况，有效地预测了强夯加固区在空间上的分布规律。研究结论对类似的强夯工程有一定的参考价值。

Three-dimensional numerical simulation of dynamic compaction of backfilled soil

Aiming at coarse-grained backfflled foundation, improvement effect of dynamic compaction has been studied by ABAUQS using geometric nonlinear three-dimensional finite element method. The plastic deformation caused by each tamping has been taken into account and the shape of the plastic zone has been identified after each drop; the parameters of soils in the plastic zone have been adjusted, which makes the base of next impact analysis. The whole process of dynamic compaction is simulated by repeating the steps mentioned above, The developments of plastic zone in different impact energies or in same impact energy but different number of drops have been obtained; and that will be used to forecast the distribution rules of reinforced zone of dynamic compaction effectively, The conclusions give some references for the practice.