基坑开挖与临近既有隧道的相互影响

发布时间：2018-04-30 21:17

本文选题：基坑开挖 + 临近隧道　；参考：《沈阳建筑大学学报(自然科学版)》2014年05期

【摘要】：目的明确基坑开挖与临近既有隧道之间的相互影响以及基坑与隧道之间设置隔离桩的作用效果.方法采用有限元数值模拟方法,分析基坑开发过程中隧道衬砌结构和基坑支护桩变形的发展变化规律.结果基坑与隧道间距越大,基坑开挖对隧道衬砌结构变形的影响就越小;隧道顶底板以及侧墙的变形发展变化规律基本一致,且随着基坑与隧道间距的增加,隧道顶底板和侧墙的变形差异也逐渐减少;临近隧道一侧的基坑支护桩最大变形大于远离隧道一侧的桩体变形;在基坑与隧道之间设置隔离桩,能有效减少两者之间的相互影响,隔离桩与隧道间距从4 m增加到8m,隧道侧墙水平变形增加约47%;在隔离桩与隧道间距4 m条件下,隔离桩桩长从12 m增加到16 m,侧墙水平变形降低约50%.结论基坑开挖与临近隧道之间的相互影响较为明显,在基坑与隧道之间采用隔离桩能起到明显的隔离效果.
[Abstract]:Objective to determine the interaction between excavation and adjacent existing tunnels and the effect of isolation piles between excavation and tunnel. Methods finite element numerical simulation method was used to analyze the development and variation of tunnel lining structure and foundation pit supporting pile deformation during the development of foundation pit. Results the larger the distance between foundation pit and tunnel, the smaller the influence of excavation on the deformation of tunnel lining structure, the law of deformation development of tunnel roof and bottom plate and side wall is basically the same, and with the increase of the distance between foundation pit and tunnel, The deformation difference between the top and bottom plate and side wall of the tunnel is gradually reduced; the maximum deformation of the supporting pile in the foundation pit adjacent to the tunnel side is greater than that of the pile body far away from the side of the tunnel; the isolation pile is arranged between the foundation pit and the tunnel. The distance between the isolated pile and the tunnel increases from 4 m to 8 m, and the horizontal deformation of the side wall increases by 47 m, and when the distance between the isolated pile and the tunnel is 4 m, the horizontal deformation of the side wall of the tunnel increases by 47 m, when the distance between the isolated pile and the tunnel is 4 m, When the length of the isolated pile increases from 12 m to 16 m, the horizontal deformation of the lateral wall is reduced by about 50%. Conclusion the interaction between excavation of foundation pit and adjacent tunnel is obvious.
【作者单位】：东北大学审计处;东北大学资源与土木工程学院;
【基金】：国家自然科学青年基金项目(51008053)
【分类号】：TU470;U451

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