STUDY ON THE INFLUENCE OF DEEP EXCAVATION ON ADJACENT SUBWAY TUNNEL DEFORMATION
The deep foundation pit project of a nearby subway tunnel in Hangzhou is taken to explore the impact of deep foundation pit excavation on adjacent subway tunnels.A three-dimensional model of the pit bottom on the posi-tive side of the tunnel is established to analyze the deformation law of adjacent tunnels during the excavation process of the foundation pit,and corresponding monitoring methods based on the research results are proposed.The results indicate that attention should be paid to monitoring cracks at the top of the tunnel during excavation of the founda-tion pit.The deformation of the tunnel is mainly characterized by uplift,resulting in horizontal displacement and tor-sion far from the foundation pit.After the horizontal distance between the foundation pit and the tunnel exceeds 25m,the excavation of the foundation pit has little impact on the tunnel.The construction of the foundation pit bot-tom plate effectively controls tunnel deformation.
deep and large foundation pitmetro tunnelstunnel deformation
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