宽路堤和地基土共同作用分析

对宽路堤填土的高度、刚度以及地基土刚度的3种不同组合,将路堤和地基一同划分网格,地基部分采用修正剑桥Biot固结耦合模型,填土部分采用弹塑性摩尔-库仑模型,进行地基沉降和水平位移有限元分析,得出宽路堤地基沉降和水平位移的分布与路堤填土高度、刚度以及地基土刚度等因素密切相关:在地基土较软、填土刚度不大的情况下,最大沉降量发生在路堤坡肩下,且随堆载的继续,最大沉降位置向内移动,且与路堤中心处的沉降差减小;当地基土较硬时,水平位移量变小,在路堤两侧不再出现最大沉降量,路堤下地基沉降差减小;当填土刚度增大,地面沉降量、水平位移量和沉降差都减小,随堆载的继续,沉降差减小显著。

Analysis of the Interaction between Broad Embankment and Its Subsoil

This paper presents the design of several embankment cases with different combinations of fill's height,fill's stiffness and subsoil's stiffness,and meshes embankment and subsoil together.The settlement and horizontal displacement of the subsoil are analyzed by FEM program applying modified Cam-clay model to subsoil and Mohr-Coulomb model to fill.The results show that the subsoil's settlement and horizontal displacement are closely related to fill's height,fill's stiffness and subsoil's stiffness,which can be concluded as follows:In the case of soft subsoil,settlement at the two sides of broad embankment is more than that at the middle part,and the location of the maximum settlement moves toward the central part as the height of loading goes on;In the case of stiffer subsoil,horizontal displacement becomes small and maximum settlement doesn't happened at the two sides of broad embankment again;In the case of stiffer fill,settlement,horizontal displacement and differential settlement become smaller,and differential settlement decreases as loading goes on.