摘要
基于三维比奥固结理论,建立了考虑渗透系数非线性耦合响应的渗流场与应力场完全耦合模型。并在深基坑降排水和开挖初期变形实测资料的基础上,采用位移反分析方法,得到模型参数中k,n,G,l 的优化取值。分别运用不考虑渗透系数耦合响应的完全耦合模型和考虑渗透系数耦合响应的完全耦合模型,对深基坑降排水及开挖过程中的围护及外围土体渗流场与应力场进行模拟,预测土体变形。与深基坑降排水及开挖过程后期的变形观测值进行比较,说明考虑渗透系数耦合响应时的计算结果与实测值更加吻合,所建立的考虑渗透系数耦合响应的完全耦合模型是可靠的和适用的。
Based on Biots consolidation theory,the fully coupling model of seepage and stress is established considering nonlinear coupling response of permeability coefficient. Applying the observed deformation data of deep foundation pit and surrounding soil during the early days of water discharge and excavation,optimal values of model parameters k,n,G and l are obtained with displacement back analysis. Seepage and stress of surrounding soil are simulated to predict deformation with the fully coupling model with and without considering coupling response of permeability coefficient,respectively. The analysis results are compared with observed data and it is showed that the calculated results with the model considering coupling response of permeability coefficient are closer to observed value than those results with the other model. So,the model considering fully coupling response of permeability coefficient is reliable and applicable.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2004年第8期1269-1274,共6页
Chinese Journal of Rock Mechanics and Engineering
基金
国家重点基础研究发展规划(973)(2002CB412707)项目资助课题
关键词
基坑工程
位移反分析
渗流场
应力场
耦合响应
渗透系数
排水
foundation pit engineering,fully coupling,displacement back analysis,coupling response,permeability coefficient
