Research On Mechanics Behavior Of Metro Station Construction Based On Dewatering For Foundation Excavation

Along with the acceleration of the integration of China’s towns and the rapid development of the economy,a large number of people have moved into cities,and the traffic pressure of cities has increased.As the first choice to ease the pressure of urban ground transportation,the subway has been widely used.Groundwater has great influence on underground engineering structure.It is of great significance to study the mechanical behavior characteristics of metro stations in high water level and water-rich areas to ensure the excavation of foundation pits and the safety of subsequent station operations.In view of this,this paper carried out the simulation of foundation pit precipitation,excavation,support and the main structure of the station based on the Xijianhe Station of Taiyuan Metro Line 2.The following research results were obtained:(1)Based on the fluid-solid coupling theory,two kinds of precipitation processes inside and outside the foundation pit are simulated,and the groundwater hydraulic type,flow path and spatial distribution of the two types of precipitation processes were analyzed.(2)The research on the precipitation effect of different depth and number of wells outside the foundation pit was carried out.The precipitation model outside the foundation pit was established,and the variation law of the water level in the foundation pit of different depth and number of wells in the two types of precipitation wells was studied.The variation law of precipitation flow and precipitation time was proved,and the total head range of precipitation well with better precipitation effect was proposed.(3)The variation law of the displacement of the foundation pit and the horizontal displacement of the underground continuous wall under different precipitation depths and coefficients were determined.The stress and deformation laws of stations and bridge structures under fluid-solid coupling conditions were coMPared and analyzed.(4)Relying on Xijianhe Station of Taiyuan Metro,and the stress and deformation laws of stations in different construction steps were studied.The precipitation well was designed based on the given data and the safety validation of some concrete components of the station was carried out.