This project involves the construction of a high-rise building that spans an existing subway tunnel.Through detailed design and analysis of the foundation pit and transition foundation,the safety of both the sub-way tunnels and the high-rise building is ensured.An integrated model is established using the m method,con-sidering the interaction between piles,soil and superstructures.By comparing results with different m values,reasonable internal forces for piles and transfer beams are derived.Midas/GTS software is utilized to analyze the impact of foundation pit excavation and superstructure construction on the subway tunnels underneath.The effects of grid-reinforcement and full-reinforcement at the foundation pit's base on the uplift of subway tunnel are compared.Additionally,finite element analysis of piles and transfer beams is conducted using Midas/GTS soft-ware.The research indicates that the larger m-value unfavorably affect piles,while smaller m-value of impact transfer beams.The ground reinforcement method and excavation sequence have impacts on the tunnel deforma-tion;the grid-reinforcement used in this project proves effective in reducing tunnel heave and offers economic advantages.The finite element analysis results of the overall model align well with the m method calculation re-sults.
NETL
NSTL
万方数据
