Impact Analysis of Foundation Pit Excavation Near the Existing Metro Station Auxiliary Structure

The foundation pit excavation near the existing metro station auxiliary structure is expected to have impact on the metro station auxiliary structure and the safe operation. Taking the construction of the deep foundation pit of a Sunken Plaza in Shijiazhuang as the background, by dividing different construction stages, MIDAS software was used to simulate and analyze the impact of the construction on the horizontal and vertical displacements attached to the neighboring stations, and the results were compared with the monitoring results. The calculated displacement is superimposed on the interval tunnel to check its reinforcement and cracks. The results show that: with the construction of the sunken square, the metro station auxiliary structure will produce horizontal and vertical displacement. The displacement of the metro station auxiliary structure reaches the maximum when the excavation reaches the bottom of the foundation pit, and the vertical displacement is mainly. After checking the displacement superposition of the metro station auxiliary structure, the reinforcement and cracks of the interval tunnel meet the requirements of the specification. By comparing the calculated results with the measured results, the deformation law of the calculated results and the measured results under various construction conditions is generally consistent, which proves that the numerical simulation results are reasonable and feasible.