竖向排水体地基下的轴对称及平面应变模型分析

Axisymmetric and Plane Strain Model Analysis of Foundation with Vertical Drainage Body

基于在实际工程中对竖向排水的三维建模比较困难,常常使用二维的平面等效应变模型进行分析.本文中根据不同的条件,分析了不同的二维平面应变模型.通过数值分析,对参数(n=re/rw,s=re/rs,η=kh/ks)进行了研究,以确定影响因素.结果显示,Hird的模型体现了良好的整体适用性.对于密实沙桩需要用不同的方法来进行有限元分析,需要考虑砂井中排水因素的刚度,同时还要考虑等效排水宽度.结果表明,在交叉区域,等效平面应变模型可以比三维分析模拟现场沉降更好.

Due to the difficulties of modeling with three dimensional（3-D） axisymmetric multidrain systems,equivalent plane-strain analysis has generally been used.In this paper,based on the different conditions,the evaluation of various two-dimensional（2-D） plane-strain models were conducted to find appropriate models.Parametric were studied to determine influencing factors（n=re/rw,s=re/rs,η=kh/ks） via numerical analysis.The results suggested that Hird＇s model showed a good overall match.Sand Compaction Pile（SCP） required different methodologies for the finite element analysis of vertical drains,and it was necessary to consider the stiffness of drain elements in sand drains and the equivalent drainage width.In the intersection zone,the effects of simulating field settlement of plane strain models were better than that of 3-D analysis.