浅埋超近接上下重叠隧道开挖面合理间距研究

徐前卫; 蒋承志; 叶颜伟; 吴祥松; 覃早; 张骏

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铁道工程学报 ›› 2024, Vol. 41 ›› Issue (3) : 73-79.

长大干线：隧道工程

浅埋超近接上下重叠隧道开挖面合理间距研究

徐前卫^1,**, 蒋承志¹, 叶颜伟², 吴祥松³, 覃早², 张骏⁴

作者信息 +

Study on the Reasonable Spacing of the Excavation Face of Shallow-buried and Super-closed Upper and Lower Overlapped Tunnels

XU Qianwei¹, JIANG Chengzhi¹, YE Yanwei², WU Xiangsong³, QIN Zao², ZHANG Jun⁴

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文章历史 +

摘要

研究目的：重庆鸡公咀上下层隧道近距离平行重叠,施工中存在相互扰动问题。针对上层隧道施工对下层隧道的扰动影响,本文采用数值模拟的方法研究上下层隧道开挖面合理间距,以降低近接隧道施工的相互影响,并达到缩短隧道施工总工期的目的。
研究结论：（1）沿隧道纵向平面内,在上下层隧道开挖面水平净距为0跨时,上层隧道对下层隧道扰动最大,为最不利净距;（2）当隧道开挖面的间距在50 m以上时,随着间距的增加,上层隧道对下层隧道的扰动有较为明显的减小;（3）当上下层隧道开挖面的间距在50 m以下时,随着间距的变化,上层隧道对下层隧道的扰动变化并不明显;（4）当上下层隧道开挖面的间距为125~150 m时,下层隧道的竖向位移值稳定在13 mm左右;（5）本研究成果可为今后类似工程的设计与施工提供参考。

Abstract

Research purposes: The upper and lower double layered tunnels of Jigongzui in Chongqing are closely overlapped in parallel, causing mutual disturbance during the construction. In view of the disturbance effect of the construction of the upper tunnel on the lower tunnel, the numerical simulation method was adopted to study the reasonable distance between the excavation surfaces of the upper and lower tunnels, so as to reduce the mutual influence of the close tunnel construction, and achieve the purpose of shortening the total construction period of the tunnel.
Research conclusions: (1)Along the longitudinal plane of the tunnel, when the horizontal clear distance between the excavation surface of the upper and lower tunnels is 0 span, the upper tunnel has the greatest disturbance to the lower tunnel, which is the most unfavorable clear distance.(2)When the distance between the excavation surfaces of the two tunnels is more than 50 m, with the increase of the distance, the disturbance of the upper tunnel to the lower tunnel is significantly reduced. (3)When the distance between the excavation faces of the two tunnels is within 50 m, with the change of the distance, the disturbance effect of the upper tunnel on the lower tunnel does not change significantly. (4) When the distance between the upper and lower tunnel excavation faces is 125 to 150 meters, the vertical displacement value of the lower tunnel is stable at about 13 mm.（5）The above research results can provide a reference for the design and construction of similar projects in the future.

导出引用

徐前卫, 蒋承志, 叶颜伟, 等. 浅埋超近接上下重叠隧道开挖面合理间距研究[J]. 铁道工程学报, 2024, 41(3): 73-79

XU Qianwei, JIANG Chengzhi, YE Yanwei, et al. Study on the Reasonable Spacing of the Excavation Face of Shallow-buried and Super-closed Upper and Lower Overlapped Tunnels[J]. Journal of Railway Engineering Society, 2024, 41(3): 73-79

中图分类号： O319.56

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