Abstract:The construction of new project near the existing urban shield tunnel is more and more difficult to avoid the subject in the city construction. Whether or not to upload or unload above the shield tunnel all produce the long-term influence on the structural stress and safe operation of shield tunnel. Aiming at this problem, the load replacement method of excavation first and light padding later is proposed in filling the embankment to solve the influence of embankment filling construction on the shield tunnel. In the analysis process, relying on an actual project, the finite element software Plaxis is used to establish the subgrade - tunnel - soil coupling model for the consideration of the displacement and excess pore water pressure. The influence of subgrade construction on the subway shield tunnel is studied, the deformation is analyzed and the relevant conclusion is obtained. The effects can be referenced for the similar projects.