基于三维土动力数值模拟的强夯法施工参数估算

Estimation of construction parameters of dynamic compaction method based on 3D soil dynamic numerical simulation

为了估算强夯法地基处理施工中的主要施工参数(有效加固深度和有效加固水平半径),利用LS-DY-NA建立三维有限元模型进行数值计算。通过对单点夯击的动力学过程进行数值模拟,得出了一次夯击后夯击塑性区分布半径和深度,这与施工试夯试验确定的有效加固深度和有效加固水平半径基本一致。数值模拟结果和现场试夯试验结果对比表明:基于LS-DYNA的土动力数值模拟与现场试夯试验相结合,可较好地估算有效加固深度和水平加固半径,并可作为强夯施工参数估算的一种有效手段。

In order to estimate the main construction parameters（including effective reinforcement depth and radius） in foundation treatment with dynamic compaction method,we apply LS-DYNA to establish a 3D FEM model to estimate the effective reinforcement depth and radius.The depth and radius of plastic area after one-time dynamic compaction are obtained through numerical simulation for the dynamic process of a single compaction point,which are in conformity with those by field test.The results show that the soil dynamic numerical simulation based on LS-DYNA is an effective measure to predict the construction parameters of dynamic compaction method combined with field test.