Analysis and Prediction of Settlement of Existing Pipeline During Shield Tunnelling
The construction of tunnels underpassing existing pipelines is prone to cause pipeline deformation and damage.In order to predict the deformation of pipelines during tunnel underpass construction,and take timely measures to control the pipeline deformation,it is important to propose a pipeline deformation prediction method.Taking a large cross-section river crossing tunnel in Shanghai as the engineering background,a numerical model of shield tunneling underpassing existing pipelines was established.The influences of tunnel diameter,pipeline diameter,net distance between pipelines and tunnels,and pipeline burial depth on pipeline deformation during the tunnel tunneling process were quantitatively studied,and a multi-factor coupling formula was obtained for the influence of tunnel construction on pipeline settlement.After the tunnel underpassing is completed,the settlements of the pipeline and the surface both show a pattern of large in the middle and small on the sides.The maximum settlement of pipeline increases linearly with the increase of the tunnel diameter and the existing pipeline diameter,and decreases linearly with the increase of net distance between pipeline and tunnel.When the pipeline diameter is less than 0.5 m,the impact on the pipeline deformation is relatively small.A fitting formula has been proposed to describe the quantitative relationship between the pipeline settlement and the three influential factors for the estimation of tunnel underpassing pipelines,to provide an intuitive reference for similar projects.
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