成层软土地基粘弹性参数反演及沉降预测  

Back-Analysis of Viscoelastic Parameters of Layeredsoft Ground and Settlement Prediction

作　　者：胡立锋[1] 林兵华 俞亚南[1] 

机构地区：[1]浙江大学建筑工程学院,浙江杭州310027 [2]浙江省温岭市交通局,浙江温岭317500

出　　处：《中南公路工程》2005年第4期9-12,共4页Central South Highway Engineering

基　　金：国家自然科学基金资助项目(50278089);浙江省自然科学基金项目(501163)

摘　　要：基于Merchant粘弹性模型,应用Biot平面固结有限元法,以现场实测资料为依据,采用了直接优化的分析方法,针对多层软土地基多设计变量反演解的唯一性问题,在对土体分层的基础上对反演策略作了改进,将反演参数分成2个部分,先分层迭代反演渗透系数,再分层迭代反演粘弹性参数,然后以反演所得参数来计算预测工后沉降,最后通过工程实例说明了这种策略的可行性。Based on the 2- D Biot＇ s consolidation FEM of the Merchant＇ s viscoelastic model and observed data, the parameters of soil are determined by direct optimal method. Then, the post settlement is predicted according to the back-analysis results. A new iterative method is put forward to solve the well-posed problem of parameters＇ back-analysis for layered soft ground, that is, coefficient of permeability and parameters of model are back-analyzed successively as two parts. At last, a case is used to illustrate that the new iterative method is feasible.

关 键 词：软土地基 粘弹性 反演 沉降 预测 

分 类 号：U416.1[交通运输工程—道路与铁道工程]