Abstract
AbstractAs we all know, the disturbance of adjacent construction will affect the safety of the existing urban power cable tunnel. However, at present, the research on the mechanism of disturbance effect of adjacent construction on existing cable tunnels and the evaluation and control index of tunnel deformation is still blank. In order to solve this problem, numerical analysis is carried out to study the influence of the size of foundation pit and the relative position of foundation pit and tunnel on the displacement and deformation of shallow-buried cast-in-situ reinforced concrete cable tunnel. The results show that the increase of excavation length of foundation pit causes large displacement and bending strain change of cable tunnel. The increase of excavation width of foundation pit has little effect on displacement and strain of tunnel. The change of excavation depth of foundation pit is related to the vertical distance between the bottom of foundation pit and tunnel, and the larger the distance, the smaller the influence of tunnel displacement is with tunnel. The horizontal net distance between road and foundation pit decreases and increases gradually, but the strain changes little. And the sensitivity of the parameters affecting the tunnel is evaluated at last. KeywordsPower tunnelConstruction disturbanceInfluence lawAssessment and control
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