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隧道施工会对邻近管线造成危害,但目前对土体位移与管线位移两者之间的关系还没有清晰的认识。针对这一问题,设计砂土中考虑不同管线管径、埋深及抗弯刚度的3组隧道施工模型试验,分析垂直下穿隧道施工过程中砂土和管线位移规律。研究结果表明,Vorster修正高斯公式能较好地拟合砂土沉降分布,其控制参数值在0.2~1.0之间变化,且与地层埋深成正比;土体沉降槽宽度系数i对管线变形有较大影响,埋深相同的条件下管线抗弯刚度与沉降值成反比;深埋管线的变形主要受上拱效应支配,且管径越大上拱效应越明显,而下拉效应主要支配着浅埋管线的位移;Smax/i为影响管土相对位移一个关键参数,在此基础上提出了修正的管土相对刚度计算公式。
Tunnel construction will be harmful to adjacent pipelines, but there is no clear understanding of the relationship between soil displacement and pipeline displacement. In response to this problem, three sets of tunnel construction model tests considering the pipe diameter, depth and flexural rigidity of different pipelines were designed. The displacement of sand and pipe during vertical tunneling was analyzed. The results show that the modified Vorster Gaussian formula can better fit the distribution of sand and soil sediment, the control parameter values vary from 0.2 to 1.0 and are directly proportional to the depth of the formation; soil settling tank width factor i has a Under the same conditions, the bending stiffness of pipelines is inversely proportional to the settlement value. The deformation of the buried pipeline is dominated by the arching effect, and the larger the pipe diameter is, the more obvious the arching effect is, while the pull-down effect mainly dominates the shallow The displacement of buried pipelines; Smax / i is a key parameter that affects the relative displacement of pipe and soil. On this basis, the formula for calculating the relative stiffness of pipe and soil is proposed.