Influence of Foundation Pit Excavation on Adjacent Railways and Strengthening Measures

The excavation of foundation pits near existing railway will cause innegligible deformation for the railway line. This paper first conducts numerical simulation for the impact of the excavation of foundation pit for a building close to existing railway lines on the deformation of the railway, and arrives at such conclusions: the excavation of foundation pits has a great impact on the railway lines. The amount of vertical deformation is beyond the requirements of relevant regulations. Accordingly, the foundation needs stabilizing treatment. After the reinforcement of high pressure jet-grouting pile, the maximum vertical deformation decreases obviously to meets the requirements. On this basis, the paper analyzes the reduction amount on different phases of the excavation to work out their respective reinforcement effect. After that, it compares the results with the real data collected during the construction to test the correctness of the model, finds out the major periods during which the vertical deformation occurs as well as the amount of deformation in each period, and points out the worst period for railway deformation during the excavation of foundation pit.