Wumeng mountain second tunnel is secondary Line from Liupanshui to Zhanyi of Guiyang-Kunming Railway reconstruction. Banuokuai Railway Station situated gate region was extended to the tunnel about 547 m
which is a large span station for 4 lines. It is the largest span (24.13 m) tunnel in Asia at present. The excavation process of the super-large span station is numerically simulated by three dimensional fast Lagrangian analysis of continua (FLAC3D) to research rationality of the design and construction. And
on the calculation results
the study was focused on secondary stress field
deformation and the plastic area. It should serve as a valuable reference for security of recommendatory construction method and removing scheme of temporary support.