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The disturbance of shield construction in coastal soft soil area poses a threat to the use and even safety of adjacent municipal transportation facilities. In order to study the influence of under-crossing shield construction on municipal transportation facilities in soft soil area, taking a practical project as an example, the author adopted numerical analysis method to conduct a comparative study of the influence of foundation reinforcement on under-crossing shield open-cut tunnels and bridges. The results show that for open-cut tunnels and bridges, foundation reinforcement can greatly reduce the deformation and internal force of the structure after under-crossing shield. At the same time, different reinforcement depths and methods will also lead to different results. The full reinforcement of 2 meters is obviously deeper than that of 3 meters, and strip-shaped reinforcement with 6-meter spacing has worse performance. Determining a reasonable reinforcement depth is of great significance for saving costs.

Research on Numerical Simulation of Soft Soil Foundation Reinforcement during the Process of Under-Crossing Subway Shield Tunnel