Influence of foundation pit excavation on displacement of existing metro tunnels and technical measures

Foundation pit excavation above metro will influence the displacement of the existing metro tunnel. Based on soil-structure interaction model, a three-dimensional analysis model for metro tunnels is established, which is used to analyze the influence of foundation pit excavation on the displacement of the existing metro tunnel. The displacement of metro tunnels is controlled using technical measures, which include soil reinforcement and block excavation. The results indicate that the displacement of metro tunnels will be changed because of foundation pit excavation. The displacement of metro tunnels can be controlled using soil reinforcement and block excavation, and soil reinforcement effect is the most obvious.