Abstract:

In order to ensure the safety and control the deformation of the existing Fuhuayuan Station structure of Chengdu Metro Line No. 1 underpassed by mined tunnel, the finite element numerical simulation method is used to analyze the structural forces of different lining forms. The internal force and deformation of the tunnel obtained by calculation can meet the design requirements. The field monitoring data analysis shows that: (1) The accumulated variation in settlement of the crown and the accumulated variation in clearance convergence of the new tunnel are -1. 5 ~-5. 0 mm and -5. 3~ -9. 1 mm, respectively, and the accumulated variation in the Fuhuayuan Station structure of Metro Line No. 1 is + 0. 71 ~ + 0. 94 mm, which is far less than the control value. (2) In case of complicated construction environment and high demand for settlement and deformation control of existing station, the correctness of CRD construction method and the necessity of separate design of secondary lining for pile cutting in platform layer are illustrated.

Key words: existing metro station, newly-built mined tunnel, finite element analysis, structural design, monitoring and analysis