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。
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 investigate 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 increasing 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 tunnel 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 backfilling 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.
作者
雷飞
田浩晟
王雪冰
刘大伟
杨宏亮
罗卫东
伍正锟
LEI Fei;TIAN Haosheng;WANG Xuebing;LIU Dawei;YANG Hongliang;LUO Weidong;WU Zhengkun(YunnanRailway Construction Headquarters,China Railway Kunming Bureau Group Co.,Ltd.,Kunming 650200,China;Key Laboratory of Traffic Tunnel Engineering of Ministry of Education,Southwest Jiaotong University,Chengdu 610031,China;China Railway Tunnel Group Construction Co.,Ltd,Foshan Guangdong 528299,China;Kunming Exploration Design Research Instituteof China Railway Second Institute Engineering Group Co.,Ltd.,Kunming 650200,China)
出处
《兰州工业学院学报》
2024年第3期37-43,共7页
Journal of Lanzhou Institute of Technology
关键词
铁路隧道
支护失效
数值模拟
平行导洞
现场监测
railway tunnel
support failure
numerical simulation
parallel pilot tunnel
on-site monitoring
