超大埋深软岩隧道平行导洞与正洞合理间距研究  

Study on the optimal distance between parallel pilot tunnel and main tunnel in deeply buried soft rock tunnel

作　　者：马建华 李剑 杨利林 雷飞 楚二庆 范庆 张峰 Ma Jianhua;Li Jian;Yang Lilin;Lei Fei;Chu Erqing;Fan Qing;Zhang Feng(Yunnan West Railway Construction Command Headquarters of China Railway Kunming Bureau Group Co.,Ltd.,Dali Yunnan 671000,China)

机构地区：[1]中国铁路昆明局集团有限公司滇西铁路建设指挥部,云南大理671000

出　　处：《山西建筑》2025年第8期133-138,共6页Shanxi Architecture

基　　金：新建丽江至香格里拉铁路区域性断裂带高地应力隧道(哈巴雪山隧道)施工科研项目(合同编号:滇西指LX2022-13号/滇西铁建2022-51号)。

摘　　要：随着我国西南地区隧道建设的发展,超大埋深软岩隧道的大变形问题逐渐显现。平行导洞作为应力释放技术,能够改善围岩应力环境,保证正洞支护结构安全。基于滇藏铁路丽香线哈巴雪山隧道,采用数值模拟与现场试验,研究了超大埋深软岩隧道中平行导洞与正洞的合理间距,综合考虑,建议间距为40 m~50 m。哈巴雪山隧道设定平行导洞与正洞间距50 m,平行导洞超前开挖100 m,正洞拱顶沉降减少6.92%,上台阶水平收敛减少14.58%,下台阶水平收敛减少10.8%。平行导洞超前开挖有效减小正洞支护变形。With the development of tunnel construction in the southwestern region of China,significant deformation issues have emerged in deeply buried soft rock tunnels.As a stress release technique,the parallel pilot tunnel can improve the stress environment of the surrounding rock and ensure the safety of the main tunnel’s support structure.This paper,based on the Haba Snow Mountain Tunnel on the Lijiang-Shangri-La section of the Yunnan-Tibet Railway,uses numerical simulations and field experiments to study the optimal distance between the parallel pilot tunnel and the main tunnel in deeply buried soft rock tunnels.Based on these considerations,a distance of 40~50 meters is recommended.For the Haba Snow Mountain Tunnel,the distance between the parallel pilot tunnel and the main tunnel is set at 50 meters,with the pilot tunnel excavated 100 meters ahead.This reduces the main tunnel vault settlement by 6.92%,upper bench horizontal convergence by 14.58%,and lower bench horizontal convergence by 10.8%.The advance excavation of the parallel pilot tunnel effectively reduces the deformation of the main tunnel support.

关 键 词：超大埋深 大变形隧道 应力释放技术 平行导洞 变形控制技术 

分 类 号：TU997[建筑科学—市政工程] U453.2[建筑科学—桥梁与隧道工程]