Abstract:When there are sensitive buildings around subway stations, in order to meet the functional requirements of buildings, the deformation control technology of foundation excavation engineering is put forward higher requirements. In this paper, taking the excavation of sensitive buildings adjacent to the foundation excavation of an ultra-deep subway station in Tianjin as an example, the influence of excavation is analyzed, and the settlement of buildings is restored by grouting in the soil layer between the ultra-deep subway station and sensitive buildings in hospital. The settlement of buildings can be controlled by dynamically adjusting the amount of grouting according to the real-time settlement value of buildings and implementing vertical uniform grouting, but it has a great adverse effect on the foundation excavation of adjacent stations. Therefore, it is proposed to reduce the influence of inclined and uniform grouting on the foundation excavation. The grouting effects of different grouting angles and different grouting ranges are analyzed, and the building settlement, station foundation excavation deformation and surface soil settlement after grouting are compared. The results show that when the inclined grouting Angle is too large, the settlement value of the adjacent side of the building will be reduced. Increasing the buried depth at the top of grouting can weaken the surface heave. This study has important theoretical and practical value for the practical project. The control effect of building settlement and the structural deformation of foundation excavation itself are taken as the basis for the evaluation of grouting effect, which is conducive to the selection of the best grouting scheme.