环间错台效应下基坑开挖引起临近地铁盾构隧道变形的能量计算法

发布时间：2018-03-15 21:13

本文选题：盾构隧道　切入点：基坑开挖　出处：《中国铁道科学》2016年03期 　论文类型：期刊论文

【摘要】：针对基坑开挖直接引发临近运营地铁盾构隧道不均匀变形的计算问题,为克服将盾构隧道视为等效均质弹性地基梁的传统算法的不足,提出了能量计算法。采用Mindlin基本解计算基坑开挖引起的隧道附加应力,并通过坐标变换使其可以考虑隧道与基坑轴线存在夹角的情况;将盾构隧道衬砌环视为由剪切弹簧连接的弹性地基短梁,并结合基坑开挖会导致盾构隧道发生环间错台的情况,建立隧道变形计算模型;利用最小势能原理建立变分控制方程,求解隧道的竖向、水平位移和环间错台量。将本文计算结果与现场实测数据和弹性地基梁法计算结果对比可知,本文算法的计算结果与现场实测数据吻合更好,而且计算效率更高。
[Abstract]:In order to overcome the traditional algorithm of treating shield tunnel as an equivalent homogeneous elastic foundation beam, this paper aims at solving the problem that the excavation of foundation pit directly leads to the non-uniform deformation of the shield tunnel adjacent to the subway shield tunnel. The energy calculation method is put forward. The Mindlin solution is used to calculate the additional stress caused by the excavation of the foundation pit, and the angle between the tunnel and the axis of the foundation pit can be considered by coordinate transformation. Considering the short beam of elastic foundation connected by shearing spring around the lining of shield tunnel and the situation that excavation of foundation pit will lead to the stagger between rings of shield tunnel, the calculation model of tunnel deformation is established, and the variational control equation is established by using the principle of minimum potential energy. The vertical and horizontal displacement of the tunnel and the displacement between rings are calculated. By comparing the calculated results with the field measured data and the results of the elastic foundation beam method, it can be seen that the calculated results of this paper are in better agreement with the field measured data. And the calculation efficiency is higher.
【作者单位】：同济大学道路与交通工程教育部重点实验室;同济大学交通运输工程学院;
【基金】：国家自然科学基金资助项目(51478353)
【分类号】：TU753;U456.3

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