The effect of demolition of support system used for deep excavation construction on surrounding structures may be inadvertently ignored by design engineers. However, structures adjacent to deep excavation construction may have stringent requirement on allowable deformation, hence it is important to study the potential deformations in adjacent structures to avoid irretrievable damage. This paper presents a case study involving the demolition of the deep excavation support system constructed for Shenzhen Ping-An Financial Center (SPFC) building (the tallest building in China when completed in 2015) on the adjacent operational metro line. An operational metro line exists along the north side of the deep excavation location, and the distance between the entrance of metro station and the deep excavation is only 5.6 m. In this study, numerical modeling approach is used to evaluate the deformation of metro line during the demolition of the deep excavation support system. Site construction observations and initial monitoring data were used to calibrate and verify the model results. The results show that the high stiffness of the metro station interdicts the displacement transfer induced by the demolition of the deep excavation. Based on the comparisons with the monitoring data, numerical analysis results are found to be reliable and they helped to evaluate the potential deformation of the adjacent metro line and provide guidance on construction sequences.
展开▼
