高速公路软基堆载预压的固结变形有限元分析

沉降与稳定观测是控制路堤填筑速度和评价超载预压效果最基本而又可靠的手段。针对高速公路路基的变形特点,以二维Biot固结理论为基础,以汕湛高速公路汕头～揭西段实际路基工程为依托,利用大型有限元分析软件ABAQUS对堆载预压法处理软土地基进行了过程数值模拟。模拟结果表明:路堤填筑速率对沉降过程有很大影响,堆载方式对孔压曲线的形状具有很大影响;模拟结果合理,对于类似工程的设计和施工具有一定的参考意义。

Finite Element Analysis of Consolidation Deformation of Pre-loading in Expressway Soil Roadbed

The observation of subsidence and stability is the fundamental and reliable means to control the speed of the roadbed construction and evaluate the effectiveness of pre-loading.According to the deformation character of expressway foundations,large area soft foundation improved by vacuum preloading,numerical simulation is used to study the consolidation deformation of pre-loading by large FEM software ABAQUS,based on the two dimensional Biot consolidation theory,supported by actual subgrade engineering on Shan-Jie Expressway.The simulation result shows that the speed of the roadbed construction has a great influence on the settlement and the way of pre-loading has a great influence on the shape of the curves about pore water pressure.It also shows that the simulation result is reasonable,and it can have a guiding significance to the design and construction of the similar engineering.