Study On Construction Technology And Deformation Of Foundation Pit Of An Yuan West Road Station

With the accelerating of urbanization, a large number of population poured into the city, which cause the shortage of urban space and traffic jam. Therefore, it is an important way to solve this problem through the exploitation and utilization of the urban 3D space. The space of urban underground would be developed and utilized in some respects: underground railway, the subway station, underground mall, underground civil air defense project and so on. Most of these projects will use deep foundation pit, it will cause a series of problems, such as foundation pit instability, surface subsidence, tilting, cracking and so on. What is worse, it will no doubt bring serious economic losses and social influence to people’s production, living and surroundings. Thus it’s of great significance to research on the technology and principle of the deep foundation pit.This paper carried out a series of simulation and monitoring which based on the engineering of deep foundation pit of Anyuan road station of Suzhou Subway line 4 combined with the actual construction situation of the project. It simulated and analysed the whole process of deep excavation support using FLAC 3D software to establish three-dimensional numerical calculation model. The research placed much emphasis on the change of the displacement of underground continuous wall, pit uplift, surface subsidence and the changing of inner-support Axle-force. It found the relationship curve between the horizontal displacement at the bottom of the underground continuous wall, pit uplift, surface subsidence and excavation step. It found that the rules of changing are basically identical between the simulation results and the field monitoring results by the comparison between calculated results and measured data, which provides effective technical support and reference about the treatment of deep foundation pit construction for the industry sources in the future.