Study on Interaction Between Undercrossing Shield Tunneling and Adjacent Structure in Different Distance

The influence of undercrossing shield tunneling and its interaction with surrounding environment is one of the hot issues in the underground engineering field.The urban tunnel construction will cause the deformation or even damage of the nearby buildings.With the construction of undercrossing tunnels,more and more undercrossing tunnels are adjacent buildings.It is a crucial problem to ensure the safety for stabilizing the superstructure and undercrossing tunnels.By means of 3D-FEM,the undercrossing shield tunneling construction of adjacent structures is simulated and studied.The results show that the influence of adjacent structure on the undercrossing shield tunneling construction cannot be neglected,and the influence scope can be expressed by L/D,which L is defined as level distance from the new tunnel axis to building axis and D is defined as outer diameter of tunnel.When L/D =0 to 2,undercrossing shield tunnel construction has great influence on building,especially,the building is in danger when L/D =1.5.When L/D =0 to 3,the value of the existing tunnel deformation and the new tunnel lining force increases obviously.Out of the region,the influence on the buildings is ignored.