Research on Deformation Laws Caused by Shield Tunnels Passing Beneath HighSpeed Railway Stations and Deformation Control Measurements

The deformation control requirements of high-speed railway stations are extremely strict， however， at present， the research on deformation laws and control measures of high-speed railway stations caused by shield tunneling is extremely lacking. In view of this problem， the paper studied the deformation control measures， analyzed deformation laws of the high-speed railway station structure caused by the shield tunneling of Tianjin Metro Line 4 under the Tianjin West Railway Station. The research showed that after the double-track shield tunneling， the heaving and sinking deformation of the plate of the basement first floor was the largest in the entire high-speed railway station structure. When the first line passed beneath the station， the overall settlement of the structure was relatively small. After underpass， the overall bottom plate bulged. When the rear line passed beneath the station， each measuring point slightly sunk in the fluctuation. The deformation of the subgrade of the first floor was significantly smaller than the base plate， both of which were less than 1 mm. The subgrade was generally uplifted on the east side and subsided on the west side. The low point was directly above the double-track tunnel， and the high point was at the pile column. Construction measures such as automated monitoring， trial excavation， secondary grouting， and synchronous grouting were effective in controlling the deformation of high-speed railway stations. The deformation law of high-speed railway stations and the control measures for underpass construction can provide reference for similar high-risk and high control requirements of adjacent construction projects in soft soil areas.