Analysis and Control Measures for the Effects of Shield Tunnel Side-passing Over Elevated Bridges
In order to ensure the safety of elevated bridges,certain measures need to be taken when the subway tunnel passes through the bridge,to ensure that the impact on the bridge meets the basic requirements for safe operation.This article uses numerical simulation to analyze the changes in horizontal displacement,vertical displacement,and settlement difference of bridges during the process of shield tunnel side-passing through a group of viaducts,and analyzes the stress on bridge piers and piles.The results show that the maximum horizontal displacement of the bridge is 1.372 mm,and the maximum vertical displacement is 0.205 mm.The displacement of the existing bridge is mainly horizontal displacement.The maximum compressive stress of bridge pier is 6.00 MPa,and the maximum tensile stress is 1.46 MPa;The maximum compressive stress of the bridge pile foundation is 5.35 MPa,and the maximum tensile stress is 0.27 MPa.All indicators meet the stress requirements.After the left-line tunnel has stabilized its settlement,construction on the right-line tunnel can proceed.The changes in various indicators for the bridge are minimal,and the impact of the shield tunnel's side-passing through the elevated bridge is within a manageable range.
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