Numerical simulation on behavior of foundation pit deformation with considering dewatering and multi-stage excavation

To analyze the stability and field measurement accuracy of foundation pit of metro station under the effect of dewatering,the 2D finite element numerical simulation for the foundation pit system was performed. The nonlinear properties of foundation were considered with the constitutive model. Aiming at the mechanical deformation characteristics of force-bearing system in the process of deep excavation,the deformation of foundation pit caused by dewatering and no dewatering was analyzed. In addition,the interaction between the underground continuous wall and soil,which mainly included the deformation of underground continuous wall,ground subsidence and bottom rebound,was considered. The results showthat the theoretical analysis results are in agreement with the actual monitoring ones. The present study can provide the basis for the favoring execution of engineering construction.