The foundation pit dewatering of subway station during excavation is an important part of the work progress.However, the job location of the subway station is generally located in the region of high population flow, and the foundation pit dewatering always brings some bad influence on the surroundings.So the foundation pit dewatering should be studied and analyzed.Based on a metro station of Line No.6 of Wuhan Metro, this paper explains the change law of surrounding building settlement and deformation of retaining structures by using the practical nonitoring data during the process of foundation pit dewatering.Main conclusions are as below:1) in terms of the influence of surrounding buildings, the effect of external foundation pit dewatering is much bigger than that of internal foundation pit dewatering; 2) the effect of external foundation pit dewatering can reduce the active earth pressure of the foundation pit lateral in some degree, and then reduce deformation of retaining structures; 3) the soil property and condition of foundation pit dewatering would have a great impact on the deformation of retaining structures.

Shield construction technology is widely used in the construction of the subway engineering, but at present, domestic and foreign studies on shield tunneling parameters are comparatively less, among which most is about EPB shield. Research on multiple linear regression analysis of slurry shield construction parameters has become almost an empty field. Therefore, it is necessary to study multiple linear regression analysis slurry shield construction parameters to ensure the safety of the construction process and to reduce project cost as well as the adverse impact of subway construction. This article takes the example of the 757 to 1460 of the left line of shield construction data of Wuhan metro line 4, uses SPSS statistical software for statistical data analysis and establishes the multiple linear regression models of the total thrust and torque. The multiple linear regression models can be used to predict the total thrust and torque of the construction. With the right line shield construction field data for engineering verification, it is found that the predicted results are in good agreement with the actual results.

Because of its high mechanization, high automation and low-impact to the surrounding buildings and structures, shield tunneling has been widely used in the subway tunnel construction. However, deformation of stratum induced by shield tunneling is prone to cause inclination and even cracking or collapse of surrounding buildings. So there are so many safety risks in the subway tunnel construction that lead to frequent accidents. Based on the site measurement results, this article chooses a certain subway tunnel section of Line No. 2 of Wuhan Metro to systematically analyze and summarize the spatial and temporal effects and influence factors of the surface subsidence including the tunnel design parameters, geological conditions and the construction parameters. The research results are helpful to the shield operation parameter optimization and adjustments, controlling and reduction of the safety risks in the construction, and provide a useful reference for similar constructions in the future.