武汉越江隧道近邻管线性状的有限元分析

Three-Dimensional Finite Element Analysis on Characters of Pipelines Surrounding Some Open Cut Part of the River-crossing Highway Tunnels of Wuhan

本文以武汉越江公路隧道明挖段为工程背景,建立了内撑式基坑围护结构、土体与地下管线变形耦合作用的三维有限元分析模型,对影响地下管线位移的因素进行了有限元分析。分析表明:基坑开挖步和支撑刚度对地下管线位移影响较大,但支撑刚度存在最优刚度值;管线埋深对其竖向位移影响的规律是先增大后减小;距离基坑越近,端部效应越强烈;多种管线并存时,相互影响不明显。

Using some open cut part of the river-crossing highway tunnels of Wuhan as engineering background, this paper established the three-dimensional finite element analysis model with considering the function among protection structure for internal brace deep foundation pit, soil body and buried pipelines. It utilized the finite element analysis on the factors which affect the movements of buried pipelines and got conclusion that it could be of certain instruction and significance to design and construction. The theoretical analysis showed that the excavation order of foundation pit and the brace stiffness have significant influence on the movements of buried pipelines and the latter has the most numerical value as to reduce the effect of the movements, that the deep buried pipelines first increase influence on their vertical movements but then reduce, and that the nearer the distance from the foundation pit, the stronger the extremity effect. When many kinds of pipelines coexist, there are little effects among them.