FULLY COUPLING ANALYSIS OF SEEPAGE AND STRESS FOR DEEP FOUNDATION PIT BASED ON DISPLACEMENT BACK ANALYSIS
基于位移反分析的深基坑渗流场与应力场完全耦合分析

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.