Construction and safety evaluation method of safety evaluation model for tunnel underneath pass construction

According to the construction and safety evaluation method of the safety evaluation model of the tunnel underpass construction, the construction method of the safety evaluation model of the tunnel underpass construction determines the hole expansion analytical solution of the target area by constructing the hole diameter elastic-plastic constitutive model, and the safety evaluation model of the tunnel underpass construction is constructed by utilizing the hole expansion analytical solution. The method comprises the following steps: determining stratum deformation caused by tunnel excavation and first pile foundation settlement caused by an existing building in a target area, determining second pile foundation settlement caused by tunnel construction in the target area based on the stratum deformation and the first pile foundation settlement, and further obtaining frame structure data of the existing building. And a second pile foundation settlement load is applied to the frame structure data to obtain frame s