Deformation Analysis and Risk Control of Pile Foundation of Subway Shield Tunnel Crossing Roads and Bridges

In view of the need for shield tunnels crossing urban roads and bridges during the construction of the Zhengzhou subway, this paper studies the overall process of shield tunnel crossing roads and bridges, the negative displacement deformation of the surrounding pile foundation due to the displacement of soil around the tunnel, and the impact on the safe use of the bridge. This paper builds a monitoring system for the whole process of subway shield tunnel crossing roads and bridges, collects and studies the data of each monitoring section during shield tunneling, and establishes a three-dimensional numerical model for the entire process of subway tunneling across roads and bridges. The actual monitoring data is combined with the finite element numerical simulation results to study the deformation law of the pile foundation of roads and bridges in the process of shield tunneling. By adjusting the construction parameters of the shield model, the bridge deformation control method is studied to provide a reference for similar projects in the future.