Stability Analysis of the Shield Tunnel Passes Through the Culvert
When the tunnel in the shield section passes through the adjacent culvert,the construction will cause large soil deformation and displacement,which increases the risk in the construction process,and also have a certain im-pact on the safety of the project itself and the culverts along the line.Based on the background of the underpass cul-vert of a shield tunnel in Qingdao,the stability of the construction in the process of crossing the river was evaluated by establishing a 3D finite element model.Combined with the construction technology of the shield underpass cul-vert,the soil displacement,segment deformation and the culvert deformation were studied.The results show that the vertical displacement and horizontal displacement of the surface are smaller,and the maximum surface settlement occurs in the upper area of the double-track tunnel,and the maximum horizontal displacement occurs on the left side of the tunnel during the excavation of the double-track tunnel;The left and right segments totally float up-wards,and the deformation of the upper part of the right segment is greater than that of the left segment.But the de-formation trend is about the same with symmetrically distributed.The maximum vertical displacement appears in the upper part of the two segments,and the displacement values are also smaller;The maximum vertical and horizontal displacement of the culvert occur in the middle of the culvert and the upper part of the shield tunnel,but the vertical and horizontal displacement are smaller.All the surface settlement,segment deformation and culvert deformation of the project meet the requirements of the construction specification.The underpass construction is feasible.The re-sults can provide a reference for the construction of tunnels under similar shield tunnels.
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