Abstract: The influence of underground excavation on the safety and stability of surface road has always been a concern for the subway metro construction. In order to maintain the safe operation of expressway during the shallow buried subway tunnel underpass construction by using the shielded excavation method, the perforated pipe shielding and grouting method can be used. Combined the engineering geological conditions at Metro No. 1 Line Station and the design parameters of metro tunnel excavation, a three-dimensional numerical simulation of the tunnel excavation process was performed by using the finite element method. The stress field, the plastic zone distribution and the expansion of the surrounding rock mass were numerically evaluated. The analysis results show that the supporting structure adopted in the construction scheme could effectively control the deformation of the tunnel and could meet the design requirements.

Key words: metro lines, numerical simulations, stability, excavation of shallow buried metro