高地应力软岩隧道平行导洞支护失效对正洞影响研究  

Study on the Impact of Support Failure in Parallel Pilot Tunnel on Main Tunnel in High Geo-Stress Soft Rock Tunnel

作　　者：霍二伦 HUO Erlun(China Railway 16th Bureau Group 3rd Engineering Co.Ltd.,Huzhou Zhejiang 313000,China)

机构地区：[1]中铁十六局集团第三工程有限公司,浙江湖州313000

出　　处：《铁道建筑技术》2025年第4期161-165,共5页Railway Construction Technology

基　　金：中国铁建股份有限公司科技研究开发计划项目(2022-B09)。

摘　　要：在超大埋深软岩隧道施工过程中,高地应力常导致大变形等灾害,平行导洞作为一种有效的卸压支护方案被广泛采用。以滇藏铁路丽香线哈巴雪山隧道为依托,通过现场监测和数值模拟,分析平导支护失效前后正洞变形和受力情况。研究结果表明,平导支护失效后,正洞变形显著加剧,拱顶沉降增幅达96.6%,上下台阶水平收敛增幅平均为16.2%。此外,围岩受力状态由受压转为受拉,导致正洞应力集中程度增加,出现明显偏压现象。随着平导塑性区显著扩大,最终与正洞的塑性区贯通,可能引发中岩墙失稳,进一步危及正洞围岩及支护结构的安全。During the construction of ultra-deep soft rock tunnels,high geo-stress often leads to significant deformation and other hazards.The parallel pilot,as an effective pressure relief support technique,is widely adopted.This paper focuses on the Haba Snow Mountain Tunnel of the Lijiang-Shangrila Railway in the Yunnan-Tibet Railway.Through field monitoring and numerical simulations,we analyzed the deformation and stress conditions of the main tunnel before and after the failure of the parallel pilot support.The results indicate that after the failure of the parallel pilot support,the deformation of the main tunnel significantly intensified,with the arch settlement increasing by 96.6%and the average horizontal convergence of the upper and lower steps increasing by 16.2%.Furthermore,the stress state of the surrounding rock changed from compression to tension,leading to an increase in stress concentration within the main tunnel and the emergence of a noticeable eccentric stress phenomenon.As the plastic zone of the parallel pilot significantly expanded,it eventually connected with the plastic zone of the main tunnel,potentially triggering instability in the middle rock wall and further jeopardizing the safety of the surrounding rock and support structure of the main tunnel.

关 键 词：软岩隧道 高地应力 支护失效 平行导洞 现场监测 数值模拟 

分 类 号：U451[建筑科学—桥梁与隧道工程]