Deformation Monitoring And Numerical Simulation Analysis Of Foundation Pit Excavation In Subway Depot

The construction and improvement of the urban transportation network can greatly promote the development of the city,and the subway has become one of the preferred modes of travel for residents.The subway depot is a management center that provides parking,maintenance,inspection,operation and repair of vehicles.When entering the depot,the vehicle needs to adopt the ground driving mode,and the construction of the municipal tunnel is required to facilitate the passage of residents.A large number of subway construction requires the construction of foundation pit engineering.A lot of research and analysis have been done on the deformation of foundation pit engineering at home and abroad.However,the regional characteristics of foundation pit engineering are obvious,and each region has its own unique pit deformation.In the case,the current study cannot cover the deformation of the foundation pit in all areas,and it needs to be analyzed based on the actual project on site.This paper takes the deep foundation pit of the municipal tunnel of Hangzhou Metro as the research background,and uses the MIDAS/GTS finite element software to establish the 3D model of the deep foundation pit of the municipal tunnel of the metro depot.The modified Mohr-Coulomb constitutive model is selected using the Mohr-Coulomb failure criterion.Theory,simulating the excavation process of foundation pit,using the method of comparing the simulation results with the on-site monitoring data,the following analysis results are obtained:the horizontal displacement of the retaining structure shows a parabolic change;the top of the retaining structure is due to the existence of concrete support.There is basically no displacement,and the displacement at the bottom of the retaining structure tends to increase slowly;the maximum displacement position of the horizontal displacement of the retaining structure shows a tendency to rise first and then rise along the longitudinal direction of the retaining structure,and finally stabilizes near the bottom of the pit;The settlement amount increases first and then decreases with the increase of the distance from the edge of the foundation pit,showing a“parabolic”variation;the amount of the bottom of the pit from the two sides of the foundation pit to the center of the foundation pit increases continuously,presenting "The distribution is large in the middle and small in both ends,and the amount of uplift at the bottom of the pit continues with the excavation of the foundation pit.Great;excavation construction steel erection support timely,it can effectively limit the horizontal displacement of the deformation of the envelope.The results of numerical simulation and monitoring data are more consistent,indicating that the established calculation model is reasonable and provides some reference for future related construction in the region.Figure 37 table 9 reference 52...