#TONRally The arch's structural form will also have a great influence on the structural force. The arch's structural form is mainly reflected in the RSR [5-7], and its safety and stability are of great significance to the entire station. Fang [8] analyzed the structural section of a subway station and concluded that for the underground excavation structure, the principle is that the arch should be arched as much as possible, and the RSR of the arch should not be greater than 1/3. Fu [9] analyzed the influence of the RSR of the inverted arch in the expansive rock stratum on the mechanical properties of the secondary lining and pointed out that the RSR of the inverted arch had the greatest influence on the inverted arch and side wall of the secondary lining. The larger the RSR, the bending moment of the secondary lining at the inverted arch and the side wall, and the axial force of the wall foot all showed a decreasing trend. Zheng et al [10] took the arch structure of the station with the PBA method as the research object and obtained the stress characteristics and surface deformation law of steel pipe columns with different RSR. Liu [11] studied the difference in the mechanical performance of bridge arch structures under different RSR.