Influence and Control Technology of Shield Tunnel and Rainwater Pipe Culvert Upper and Lower Parallel Construction
Taking the actual rail transit shield section project as the background,a comparative analysis of the structural stress and deformation characteristics caused by using a small-diameter double-hole tunnel and a large-diameter single-hole tunnel to penetrate a three-parallel rainwater pipe culvert group at close range was introduced.The mutual influence mechanism of construction was expounded,and the rainwater pipe culvert deformation control technology was proposed,which was finally verified through on-site monitoring data.The study shows that using the small-diameter double-hole tunnel shield excavation scheme,the excavation of the right-line tunnel increases the vertical displacement of the rainwater culverts,while the subsequent excavation of the left-line tunnel exacerbates the vertical deformation of both the right-line tunnel and the rainwater culverts.The impact on the vertical displacement of the rainwater culverts between the small-diameter double-hole tunnel scheme and the large-diameter single-hole tunnel scheme is minimal,with the former showing a slightly larger vertical displacement at the tunnel crown by 0.5mm.The two schemes meet design specifications,but the small-diameter double-hole tunnel scheme is more economical.In addition,the use of excavation parameter control,admixture control,grouting control behind the wall,and surface settlement control of the shield tail can effectively reduce the deformation of adjacent rainwater pipes and culverts.
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