隧道侧方基坑对隧道上方围岩压力拱的影响分析
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U451

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国家自然科学(51778095)


Analysis of the Influence of Tunnel Lateral Foundation Pitch on the Pressure Arch of Surrounding Rock above Tunnel
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    摘要:

    现有关于基坑开挖对邻近隧道影响研究多是从位移变形和地表沉降直接探测其影响,鲜有研究从围岩“压力拱”来分析基坑对侧方隧道上方围岩稳定性影响。本文基于应力路径法原理,运用ANSYS有限元数值模拟,从既有基坑对新建隧道与新建基坑对既有隧道这两方面,研究基坑不同深度、不同宽度、不同基坑与隧道之间的净距这三个因素分别对侧方邻近隧道及上方围岩压力拱内外边界的影响规律。结论如下:既有隧道上方压力拱内外边界受侧方新建基坑不同深度、宽度和净距的影响敏感度低于新建隧道受侧方既有基坑不同深度、宽度和净距的影响敏感度,且敏感度相差最大的影响因素是基坑宽度。引入内边界增加值“Δh”,用于计算隧道在基坑影响下增加的竖向均布荷载,并判定上方围岩是否成拱,重新确定隧道深浅埋高度,并列出一定参考值。该研究可为隧道邻近基坑施工时的稳定性和安全性研究提供参考借鉴。

    Abstract:

    Most of the existing studies on the influence of foundation pit excavation on adjacent tunnels are based on displacement deformation and surface settlement. Few studies analyze the influence of foundation pit on the stability of surrounding rock above lateral tunnels from the surrounding rock "pressure arch". Based on the principle of stress path method and using ANSYS finite element numerical simulation, this paper studies the influence of three factors, namely, different depth, different width of foundation pit, different net distance between foundation pit and tunnel, on the internal and external boundaries of adjacent tunnel and surrounding rock pressure arch above. The conclusions are as follows: the sensitivity of the inner and outer boundary of pressure arch above the existing tunnel affected by different depths, widths and net distances of the newly built foundation pit on the side is lower than that of the newly built tunnel affected by different depths, widths and net distances of the existing foundation pit on the side, and the biggest difference in sensitivity is the width of the foundation pit. The internal boundary added value “Δh” is introduced to calculate the vertical uniform load of the tunnel under the influence of the foundation pit, and it is determined whether the surrounding rock is arched, the depth of the tunnel is re-determined, and a certain reference value is listed.This study can provide a reference for the stability and safety study of the tunnel adjacent to the foundation pit construction.

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高峰,齐怀远,张捷,等. 隧道侧方基坑对隧道上方围岩压力拱的影响分析[J]. 科学技术与工程, 2020, 20(8): 3291-3301.
Gao Feng, Qi Huaiyuan, Zhang Jie, et al. Analysis of the Influence of Tunnel Lateral Foundation Pitch on the Pressure Arch of Surrounding Rock above Tunnel[J]. Science Technology and Engineering,2020,20(8):3291-3301.

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  • 收稿日期:2019-06-28
  • 最后修改日期:2019-12-20
  • 录用日期:2019-11-02
  • 在线发布日期: 2020-04-29
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