冲击荷载加固软土地基数值模拟分析

Numerical simulation analysis of soft soil foundation reinforcement under impact loading

针对强夯法加固软土地基易出现"橡皮土"和超孔隙水压力难消散的问题,结合某软基加固工程,在对部分土层和参数做简化处理的基础上,应用FLAC3D软件渗流场和应力场的耦合,建立冲击荷载加固软土地基数值计算模型,分析了在冲击荷载作用下任意时刻的孔隙水压力沿深度的变化趋势、土体位移的变化情况和土体应力的变化情况,为沿海地区软土地基加固提供技术指导。

In view of easy occurrence of ＂rubber soil＂ and difficult dissipation of excess pore water pressure during soft soil reinforcement with dynamic compacting method, in combination with a soft foundation reinforcement project, based on simpli- fied treatment of part of soil layers and parameters, the coupling of seepage field and stress field with FLAC3D software was applied to establish the numerical calculation model of soft soil foundation under impact loading, and the changing trend of pore wa- ter pressure along depth, the changes in soil mass displacement and changes in soil mass stress at any time under the impact loading were analyzed, which provides tech- nical guidance for soft soil foundation reinforcement in coastal areas.