【摘要】 通过对工程实例的有限元分析及离心机模型试验，研究了有软弱下卧层的双层体系地基的变形特性，以及土层厚度及模量对变形沉降的影响．持力层厚度越厚，模量越大以及与下卧层模量比越小，沉降越小；反之越大．而影响有限元分析精度的关键因素是对双层体系地基中地下水变化的模拟．研究内容为双层体系地基强度又沉降变形验算和地基加固深度的估算提供了依据．更多还原

【Abstract】 In this paper, the characteristics of a double-layer subgrade with a very soft underlayer, and the effects of the thickness and the modulus of soil on the settlement are studied by using a group of centrifuge model tests and the analysis of some case histories with F.E.M.The thicker the bearing layer thickness and the bigger the modulus as well as the smaller the ratio of modulus with the underlayer, the smaller the settlement will be. The key factor to affect the accuracy of F.E.M. analysis is the simulation of the variation of pore water in the subgrade.更多还原