Research on the Existing Subway Station Structure Safety Effected by Foundation Pit Excavation

Research purposes: During the process of subsequent property development on the existing station,the larger foundation pit excavation impacts on the subway station structure obviously. In order to guarantee the safety of metro operation,the paper analyses the characteristics of stress and strain of soil during foundation pit construction process by numerical simulation model,and studies the of foundation pit excavation on subway station structure,then evaluates the safety of subway station structure,at last,it gives some suggests for the project.Research conclusions:( 1) The subsequent property development has a adversely influence for the close neighbour existing subway station structure and rail.( 2) In the process of foundation pit excavation,the deformation mainly appears at the bottom of the foundation pit,it should make a reasonable construction scheme,and follow the time-space effect principle,to avoid large soil excavation.( 3) In the process of simulation,the influence to the subway station because of the foundation pit settlement is the local stress concentration,it need reasonable simplification on the key point of construction process,which could ensure the simulation accuracy and calculation completeness.( 4) Itneeds to strengthen the deformation monitoring of the near subway station structure during the process of construction,which could ensure safe operation and construction smoothly.( 5) According to the practical engineering for analysis,the study results in this paper can be applied in treatment of the influence of the existing subway structure because of the subsequent property development.