基于有限差分法的高地应力隧道平导支护失效对正洞影响分析
Analysis of Influence of Support Failure on Main Tunnel in Parallel Guide Tunnel of High Ground Stress Based on Finite Difference Method
雷飞 1田浩晟 2王雪冰 1刘大伟 1杨宏亮 1罗卫东 3伍正锟4
作者信息
- 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 昆明 650200
- 2. 西南交通大学 交通隧道工程教育部重点实验室,四川 成都 610031
- 3. 中铁隧道局集团建设有限公司,广东 佛山 528299
- 4. 中铁二院昆明勘查设计研究院有限公司,云南 昆明 650200
- 折叠
摘要
为探究高地应力下隧道平导支护结构破坏后的影响范围及对正洞影响程度,以丽香铁路在建玉龙雪山特长隧道为依托工程,采用数值模拟的方法,分析平导正洞不同净距及不同失效程度下,正洞围岩变形及支护结构受力变化规律,探明了正洞对不同情况下平导支护失效的敏感程度.结果表明:平导支护体系完全失效所导致的正洞支护结构受力变化随净距减小呈先增大后减小的趋势,净距为1.5 倍平导跨度时对正洞变形影响程度最大;正洞结构受力变化对平导径向锚杆失效最为敏感.高地应力隧道下平导支护结构失效对正洞影响较大,应对平导进行回填土或加强支护等措施,研究成果可为类似工程施工优化提供参考.
Abstract
To investigate the extent of influence and the impact on the main tunnel after the collapse of the tunnel lining support structure under high ground stress.Taking the under-construction Yulong Snow Mountain extra-long tunnel of the Yili-Xiang railway as the basis for the study,numerical simulation methods are employed to investi-gate the deformation of surrounding rock and the force changes in the support structure in the main tunnel under various clearances and degrees of failure.This study aims to determine the sensitivity of the main tunnel to the failure of the pilot tunnel support under different circumstances.The results show that the force changes in the main tunnel support structure due to the complete failure of the pilot tunnel support system show a trend of in-creasing first and then decreasing as the clearance decreases.The influence on the deformation of the main tunnel is most significant when the clearance is 1.5 times the span of the pilot tunnel.The force changes in the main tun-nel structure are most sensitive to the radial anchor failure of the pilot tunnel.In tunnels with high ground stress,the failure of pilot tunnel support structures has a significant impact on the main tunnel.Measures such as back-filling the pilot tunnel or strengthening its support should be implemented.The research findings can provide a reference for the optimization of construction in similar projects.
关键词
铁路隧道/支护失效/数值模拟/平行导洞/现场监测Key words
railway tunnel/support failure/numerical simulation/parallel pilot tunnel/on-site monitoring引用本文复制引用
出版年
2024
NETL
NSTL
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