超大埋深软岩隧道超前中导洞竖向合理位置研究  

Research on the Vertical Reasonable Location of the Advanced Middle Pilot Tunnel in Super Deep Buried Soft Rock Tunnel

作　　者：张贺伟 ZHANG Hewei(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156-160,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：超大埋深软岩隧道常伴有较高地应力,大变形灾害较为突出。采用超前中导洞应力释放技术提前释放部分地应力,可有效解决由于大变形带来的诸多问题。依托滇藏铁路丽江段哈巴雪山隧道,采用文献调研、数值模拟及现场试验等手段研究超前中导洞竖向不同位置下围岩变形、支护受力规律及围岩塑性区分布,并通过现场监测数据分析超前中导洞应用效果。结果表明,超前中导洞不同竖向位置均有一定的应力释放效果,当超前中导洞拱顶距正洞拱顶2 m时,应力释放效果及支护受力较为理想,且现场实测隧道变形平均可减小44.52%。研究结果可为类似工程采用超前中导洞设计提供参考。High geo-stress is often accompanied in super deep soft rock tunnels,and large deformation disasters are more prominent.Using the stress release technology of the advanced middle pilot tunnel to release part of geo-stress in advanced middle pilot tunnel can effectively solve many problems caused by large deformation.Therefore,relying on the Haba Snow Mountain Tunnel in the Lixiang section of the Yunnan-Tibet Railway,we used literature research,numerical simulation,and on-site testing to study the deformation,support stress patterns,and plastic zone distribution of the surrounding rock at different vertical positions of the advanced middle pilot tunnel.Subsequently,the application effect of the advanced pilot tunnel was analyzed using on-site monitoring data.The results indicate that different vertical positions of the advanced middle pilot tunnel have certain stress-release effects.When the arch top of the advanced middle pilot tunnel is 2 meters away from the arch top of the main tunnel,the stress release effect and support forces are relatively ideal.Moreover,the average deformation of the tunnel measured on site can be reduced by 44.52%.The research results can provide reference for similar projects in adopting the design of advanced middle pilot tunnel.

关 键 词：软岩隧道 超前中导洞 数值计算 大变形隧道 应力释放技术 竖向合理位置 

分 类 号：U451[建筑科学—桥梁与隧道工程]