堆载预压处理滨海软基三维数值分析

塑料排水板在处理软土地基中已广泛应用.针对塑料排水板地基目前主要分析方法是将其转化为平面应变有限元,然而计算的孔隙水压力和水平位移结果不理想.基于ABAQUS排水板单元建立较大规模的三维有限元模型,结合某塑料排水板堆载预压处理软基工实例模拟分析.计算所得的软基的沉降曲线、孔压曲线与现场测量值比较吻合,证实了模型中三维排水板单元的可靠性.通过改变施加填土的时间以及堆载预压的时间,对比观察软土地基超孔隙水压力和地表沉降的变化规律,确定最佳的施工方案.为以后堆载预压处理软土地基的设计与施工提供指导和参考.

Three-Dimensional Numerical Analysis of Coastal Soft Soil Foundation Consolidation by Surcharge Preloading

Plastic drainage plate has been used widely to treat soft soil foundation. Now， the popular analysis method for plastic drainage plate foundation is plane strain finite element method. However， the pore water pressure and horizontal displacement results are unsatisfactory. In this paper， a large scale 3D finite element model is established to simulate the soft soil foundation using ABAQUS， combined with an engineering example of reinforcing soft-soil foundation by preloading with plastic drainage plate. The calculated settlement curve and pore pressure curve of soft soil foundation agree with the field measurements， confirming the reliability of 3D PVD element. By changing the time of filling and the time of preloading， observing the variation of excess pore water pressure and surface subsidence， the best construction scheme is determined. The research results can provide guidance and reference for the design and construction of the soft soil foundation preloading in the future.