Study On Construction Mechanics And Earthquake Resistance Of Subway Station

With the rapid growth of urban economy and population,the construction of subway station become extrely important in order to improve traffic conditions.The construction of subway station projects often involves a large number of foundation pit and tunnel construction,these projects always located in the areas with dense population,traffic and building.As a result,it is very important to understand the variation law of the displacement of enclosure structure and soil caused by subway station construction.In our country,many cities are in active earthquake area,once an earthquake occurs,it may cause catastrophic damage to the subway station,so it is necessary to study the seismic response of the subway station.The three-dimensional numerical simulation of Shijiazhuang metro station project is carried out by using ANSYS finite element software.The following several aspects are mainly studied.(1)The variation law of the displacement of enclosure structure,ground surface and the uplift of foundation pit caused by Shiguangjie station construction are analyzed,and crown beam,shotcrete,steel purlin and the physical and mechanical parameters of the materials influence on the horizontal displacement of pile body in foundation pit construction are studied through comparative analysis.(2)Based on the excavation and support engineering of shallow excavation section in Changchengqiao station,the vertical displacement of ground surface and enclosure structure are analyzed along the longitudinal and transverse directions during different excavation step.(3)Tianjin wave acceleration data is used as the earthquake load,the acceleration,displacement and Mises stress response of the station structure under seismic load and the variation of along the longitudinal direction are analyzed.