路堤软基变形有限元计算分析

基于Biot固结理论,考虑土体侧向变形,空间渗流,对某路堤软基固结变形作平面应变,空间渗流情况下的有限元计算分析.根据有限元计算结果,分析了路堤填筑过程中软基的沉降变化、土层分层沉降以及侧向变形,并且预测了路堤填筑完毕后软基的工后性状,并将有限元计算结果与工程实测资料进行了对比.研究表明,有限元计算结果与实测沉降曲线拟合程度在前期较好,后期差异较大;淤泥质亚粘土层为主要变形土层;软基侧向变形呈现随深度先增大后减小的趋势,在填筑完毕后开始收缩,并对纵向沉降速率有影响.

NUMERICAL ANALYSIS OF SETTLEMENT OF SOFT CLAY FOUNDATION AND EMBANKMENT

Based on Biot Consolidation Theory,considering with lateral deformation and spatial seepage of soft clay,this paper analyses the settlement of soft clay foundation under the load of upper embankment using FEM on the condition of plane settlement and spatial seepage.From the conclusions of FEM,the behavior of soft clay foundation is analysed respectively for the settlement of soft clay foundation,the stratification settlement and the lateral deformation of soft clay,and the character of soft clay after the upper embankment loading is pre-estimated.It is believed that,the difference between FEM's solutions and actual measurement for settlement-time curve is relatively smaller at the beginning than later;the proportion of the settlement of mucky mild clay is the biggest in the whole soft clay;the lateral deformation of soft clay firstly increases with variety of the increasing depth,then decreases.However,after finishing the upper embankment loading,the lateral deformation begins to shrink which affects the velocity of vertical settlement.