Influence Simulation Analysis of New Road Pile-plate Structure Construction on Deformation of Adjacent Metro Tunnels and High-speed Railway Bridges

Objective The construction of road pile-plate structures can significantly impact adjacent metro tunnels and railway structures. Under stringent regulatory requirements and complex engineering conditions, it is essential to ensure the safety of existing metro and railway structures. Method Based on the new Bai′an Highway project, numerical simulation methods are utilized to construct a Plaxis3D finite element calculation model. This model simulates various construction conditions to analyze the impact of pile-plate structure construction process on the adjacent existing metro and high-speed railway. Result & Conclusion The research results indicate that during the construction of bored cast-in-place piles in this road project, adverse conditions such as hole collapse and soil plug effect are likely to occur. These conditions can negatively impact adjacent metro lines, causing metro tunnel displacement and convergence deformation to exceed control values. In contrast, the construction process has less impact on high-speed railway bridges, with deformation remaining within controllable limits. Therefore, it is necessary to improve and optimize the road construction plan, such as increasing the distance between pile foundation and metro tunnels and extending the length of some piles. A safety assessment of the optimized design scheme is conducted, and subsequent numerical simulation results show that the metro tunnel displacement and deformation caused by road construction can meet the required standards, ensuring metro tunnel structural safety.