上伏溶洞对深埋特大断面隧道的稳定性影响及其安全距离研究
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1.贵州大学土木工程学院;2.贵州省公路工程集团有限公司

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U45

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贵州省重大科技专项(黔科合重大专项字[2018]3011);贵阳城市轨道交通科研项目(GD3-FW-YJ-05-2020-13-ZB );贵州省自然科学基金(黔科合基础-ZK[2022]一般082);贵州省自然科学基金(黔科合基础[2019]1057号。


Influence of upward cavities on the stability of deeply buried mega-section tunnels and its safety distance study
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School of Civil Engineering, Guizhou University

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    摘要:

    为了探索上伏溶洞对深埋软弱破碎围岩特大断面隧道的稳定性影响及其安全距离,通过数值模拟方法研究溶洞洞径为8m、10m、12m,以及溶洞与隧道的间距为3m、4m、5m、6m时,溶洞直径以及间距对隧道稳定性的影响和及其安全距离研究。结果表明:1)当溶洞直径不变时,拱顶沉降随着溶洞与隧道的间距增加而减小,拱顶竖向压力随着间距的增加而减小;当隧道于溶洞的间距不变时,拱顶沉降随着溶洞直径的增加而增加,隧道拱顶压力随溶洞直径的变化不明显。2)上伏溶洞对深埋隧道的拱腰水平收敛和水平压力、拱底隆起和竖向压力无明显影响。3)当溶洞直径不大于8m,且溶洞与隧道的间距小于3m时,隧道处于不稳定状态,该工况下的安全距离为3m;当溶洞直径为8-10m时,且溶洞与隧道的间距小于5m时,溶洞处于不稳定状态,该工况下的安全距离为5m;当溶洞直径为10-12m时,且溶洞与隧道间的距离小于6m,则隧道处于不稳定状态,该工况下安全距离为6m。4)本次研究发现,当溶洞位于隧道上方,且不考虑溶洞充水的状态下,隧道最危险的位置并不是位于隧道与溶洞间的最小距离处,而是位于溶洞的边缘的下方。

    Abstract:

    In order to investigate the influence of upward-facing caverns on the stability and safety distances of deeply buried weak and fragmented peripheral rock tunnels with large cross sections, a numerical simulation method was employed. The study examined the effects of cavern diameter (8m, 10m, 12m) and spacing between the caverns and tunnels (3m, 4m, 5m, 6m) on tunnel stability and safety distances. The findings are as follows: 1) When the diameter of the karst cave remains constant, the settlement of the dome decreases as the distance between the cave and the tunnel increases, and the vertical pressure on the dome decreases with the increase of distance. When the distance between the tunnel and the karst cave remains constant, the settlement of the dome increases with the increase of the diameter of the cave, and the pressure on the tunnel’s dome is not significantly affected by the changes in the diameter of the cave. 2) The presence of uplifted caverns has no significant impact on horizontal convergence and horizontal pressure at the arch girdle, as well as uplift and vertical pressure at the arch base of deeply buried tunnels. 3) When the diameter of the cavern is not greater than 8m and the distance between the cavern and the tunnel is less than 3m, the tunnel is in an unstable state with a safety distance of 3m. When the diameter of the cavern is between 8-10m and the distance between the cavern and the tunnel is less than 5m, the cavern is in an unstable state with a safety distance of 5m. When the diameter of the cavern is between 10-12m and the distance between the cavern and the tunnel is less than 6m, the tunnel is in an unstable state with a safety distance of 6m under these conditions. 4) In this study, it was found that when the cavern is located above the tunnel and the cavern is not considered to be filled with water, the most dangerous location of the tunnel is not located at the minimum distance between the tunnel and the cavern, but below the edge of the cavern.

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王义乾,刘远明,杨智成,等. 上伏溶洞对深埋特大断面隧道的稳定性影响及其安全距离研究[J]. 科学技术与工程, , ():

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  • 收稿日期:2023-10-19
  • 最后修改日期:2024-05-17
  • 录用日期:2024-05-21
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