【摘要】 简化地下管线的三维力学计算模型,利用随机介质理论推导的土体沉降计算公式,得到类矩形盾构隧道施工对垂直交叉地下管线变形、弯矩、应力和应变的计算公式,通过算例分析土质条件、管线埋深和管线直径以及管壁对管线所受极限弯矩的影响。研究结果表明:管线极限弯矩受土质条件的影响较大,砂土中管线所受的最大极限弯矩大于黏土,但黏土中极限弯矩的影响范围更广;随着管线埋深的增加,管隧间距变小,隧道施工对管线的影响变大,管线所受的极限弯矩随之变大;管径和管壁的改变对管线所受极限弯矩有较大影响,管径的缩小造成管线的抗弯刚度减小,导致管线极限弯矩减小。更多还原

【Abstract】 In this paper, the calculationformula of deformation, bending moment, stress and strain of underground pipeline with vertical intersection are obtained by the simplifiedthree-dimensional mechanical model with the soil settlement derived from stochastic medium theory under quasi-rectangular shield tunnel construction. In addition,the influence of the soil quality and theburied depth, the diameter and the wall thickness of the pipelineon the ultimate bending moment(UBM)of the pipelineare analyzed by numerical examples. The results show that the UBM of the pipeline is greatly affected by the soil conditionthat the maximum UBM in the sand is larger than that of the clay whereas the limit bending moment of the clay has a wider range of influence. With the increase of the buried depth of the pipeline, the pipe-to-pipe spacing becomes smaller, the influence of tunnel construction on the pipeline becomes larger, and the ultimate bending moment of the pipeline becomes larger. The change of pipe diameter and pipe wall has a greater influence on the UBM of the pipeline that the reduced pipe diameter leads to the bending stiffnesss, hortage, which result in a reduction in the UBM of the pipeline.更多还原