Study on deformation law and influencing factors of subway deep excavation by numerical simulation

Taking the deep foundation pit of the subway station in some city of the loess area as background,a finite element model was established,and the analysis on the construction process of the deep foundation pit was conducted,then the deformation law of the deep foundation pit palisade structure in different processes.Taking soil strength,steel strut position and pile depth in soil as influencing factors,they were simulated and analyzed respectively.Research showed that : the finite element simulation method could effectively reflect maintenance structure displacement deformation law of foundation pit,the change of loess sticky gathered force,steel strut position of pile and retaining pile's depth in soil had certain influence on pit supporting structure and surface displacement around,the steel strut position was optimal position setting in the design.