Study on the excavation construction of deep foundation pit engineering of subway station

Through analyzing foundation pit engineering of subway No.2 line of Suzhou railway station,based on space-time effect theory,the paper introduces the excavation method of sub-region,sub-layer,sub-section,symmetry,balance,specifically describes construction procedure and construction methods of foundation excavation,and introduces relevant technological measures.Through rationally determining support system and comprehensively controlling foundation pit deformation and other measures,it guarantees the smooth excavation of deep foundation pit,ensures the foundation pit stability and the security of surrounding buildings and pipeline,which has provided a kind of new idea for similar engineering construction.