Research on mechanical behavior of metro concrete structure suffered traversing construction influence of new subway

摘要

Based on the engineering construction of new subway across existing metro tunnel, the settlement law of the existing metro concrete structures was researched due to construction perturbation under existing metro tunnel. According to the in-situ monitoring information and engineering geological conditions, the foundation model, structure analysis model and settlement curve model which are suitable for the main structure deformation have been respectively established, and the internal force and the stress law of the main structure were obtained through deformation analysis. The structure limit analysis model the maximum settlement, the maximum settlement difference value and the distributive characteristics of deformation and the internal force were determined in the whole construction period. The safety stability of the main structure and the normal operation of existing metro tunnel were evaluated, and the warning value was provided for the in-situ construction control.