摘要
高地应力软岩隧道挤压大变形破坏是一种潜在的严重工程地质灾害,为进一步认识高地应力软岩隧道变形控制技术,结合兰新高铁大梁隧道大变形实况,在分析和总结大变形破坏特征基础上,通过支护方案试验对比,确定支护方案;提出主要控制措施、施工注意事项等施工关键技术,最终形成了一套有效的高地应力软岩隧道大变形控制技术,凝练出"宁强勿弱、宁补勿拆,抗放结合、快速成环"16字处治方针,对后续川藏铁路设计及施工均具有重大指导意义。
The large deformation failure of tunnels in soft rock under high geo-stress conditions due to crushing is a potential serious geological disaster.In order to further understand the deformation control technology for such tunnels,Daliang Tunnel of Lanzhou-Xinjiang High-speed Railway was taken as an example to analyze and summarize the characteristics of large deformation failure,based on which several optional support schemes were tested and compared,and the final support scheme was determined.Then,this paper put forward key construction technologies including major control measures and construction precautions,formed a set of effective large deformation control technologies for tunnels in soft rock under high geo-stress conditions,and summarized the principle as“better strength than weakness,better reinforcement than demolition,combination of resistance and release,and rapid loop formation”,which has great guiding significance for the subsequent design and construction of Sichuan-Tibet Railway.
作者
杨星智
李葳
李曙光
王平安
YANG Xingzhi;LI Wei;LI Shuguang;WANG Ping'an(China Railway 20th Bureau Group Co Ltd,Xi'an Shaanxi 710016,China;Scientific&Technical Information Research Institute,China Academy of Railway Sciences Corporation Limited,Beijing 100081,China)
出处
《中国铁路》
2022年第1期51-56,共6页
China Railway
基金
中国博士后科学基金(2020M673525)
中铁二十局集团科技研究开发计划项目(YF2000SD01A)。
关键词
兰新高铁
大梁隧道
高地应力
软岩
大变形
支护
Lanzhou-Xinjiang HSR
Daliang Tunnel
high geo-stress
soft rock
large deformation
support
