Deformation characteristics analysis on foundation pit at Dalian subway station

Foundation pit engineering is a comprehensive engineering system.Currently the research on the deformation of deep foundation pit,in particular subway foundation pit,is limited.This paper investigates the deformation characteristics of subway foundation pit and the relationship between pit deformation and excavation depth at Dalian subway station foundation pit.Using the methods of statistical analysis and numerical fitting,the measured data from foundation pit are analyzed.The results show that the maximum of surface settlement is about 0.154 % of foundation pit depth,the maximum of lateral displacement of retaining structure is about 0.159 % of foundation pit depth.In addition,the maximum value of ground settlement and the maximum lateral displacement of retaining structure is very close to 0.97.Through the statistical result analysis,it provides a basis for the follow-up construction design on subway station.Therefore,the movements of ground surrounding the subway station caused by deep foundation pit deformation can be economically and effectively controlled.