超载预压软基固结边界面弹塑/粘塑性分析

Bounding Surface Elastoplastic-viscoplastic Analysis on Soft Clay of Heaped Load Precompression

在Biot固结理论中使用简化的边界面弹塑/粘塑性模型,对超载预压法处理公路软基全过程的变形和孔压进行数值计算。与理想弹塑性模型计算的结果相比,使用边界面模型计算的沉降量较大,也更接近实际观测值,其原因在于后者考虑了弹塑性与粘塑性的耦合作用以及卸超载后路面修筑过程中出现的塑性变形。

The simple bounding surface elastoplastic-viscoplastic model was used in Biot＇ consolidation theory. The deformation and pore pressure of road soft clay improved by heaped load precompression was calculated numerically. In contrast to ideal elastoplastic model, the settlement was larger by means of the bounding surface model, but it was closer to the fact. The reason was the coupling action of elastoplastic and viscoplastic and the plastic deformation after overloading or unloading during road construction were considered in bounding surface model.