双基坑开挖对邻近隧道结构变形影响分析

发布时间：2018-10-15 08:32

【摘要】：通过建立三维有限元数值模型,分析了双基坑开挖不同施工阶段对已有隧道变形的影响.结果表明:双基坑与邻近隧道平行布置时,隧道会发生较大变形,其水平最大位移比垂直布置时的大10%,且后开挖基坑造成的隧道位移较先开挖基坑变形大7%左右;双基坑与隧道垂直布置时,远隧道基坑开挖对隧道影响极小,隧道变形主要由近隧道基坑开挖决定.针对上述水平布置和垂直布置工况均发现,隧道一侧双基坑开挖施工对隧道的水平位移影响较大,竖向位移约为水平位移的1/10.隧道本身在竖直方向变形为上下向中心挤压,隧道在水平方向上有指向基坑的侧移,同时隧道本身的变形为中心向两侧拉伸,且在开挖基坑中心位置对应处隧道的位移与变形最为明显.
[Abstract]:Through the establishment of three-dimensional finite element numerical model, the influence of different construction stages of double foundation pit excavation on the existing tunnel deformation is analyzed. The results show that when the double foundation pit is arranged parallel to the adjacent tunnel, the tunnel will deform greatly, and the maximum horizontal displacement is larger than that of the vertical one, and the tunnel displacement caused by the excavation of the foundation pit after excavation is about 7% larger than that of the first excavation foundation pit. In the vertical arrangement of double foundation pit and tunnel, the influence of excavation on tunnel is minimal, and the deformation of tunnel is mainly determined by the excavation of near tunnel foundation pit. According to the above horizontal and vertical layout conditions, it is found that the excavation of one side of the tunnel foundation pit has a great influence on the horizontal displacement of the tunnel, and the vertical displacement is about 1 / 10 of the horizontal displacement. In the vertical direction, the tunnel itself is squeezed up and down to the center, and the tunnel has a lateral direction pointing to the foundation pit in the horizontal direction, and the deformation of the tunnel itself is stretched on both sides of the center. The displacement and deformation of tunnel are most obvious in the center of excavation foundation pit.
【作者单位】：上海理工大学环境与建筑学院;
【基金】：上海市自然科学基金资助项目(15ZR1429400)
【分类号】：TU753;U451

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