Numerical Simulation Analysis of Electric Shield Tunnel Side-crossing Existing Bridge at Close Distance
Based on the background of a electric shield tunnel project,this paper adopts the method of field monitoring and numerical simulation to obtain the variation law of displacement and stress of bridge deck and bridge pile foundation when the tunnel is close distance variable curve side-crossing,and analyzes the influence of tunnel side-crossing.The research results show that the horizontal and vertical displacements of the bridge deck and bridge pile foundation gradually increase during the tunnel side-crossing process,and the displacement caused by the tunnel side-crossing stage is larger,and the later displacement gradually tends to be stable.The excavation of the shield tunnel causes the loss of the surrounding rock stratum at the lower part of the bridge,and the soil near the tunnel side undergoes asymmetric deflection,resulting in uneven vertical displacement of the bridge deck as a whole and shifting to the side near the tunnel.When the shield tunnel is close distance variable curve side-crossing,reasonable shield tunneling parameters should be selected to reduce the disturbance to the bridge deck and bridge pile foundation.
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