挤压性围岩隧道修建关键技术综论

A Review of Key Construction Technologies of Tunnels with Squeezing Surrounding Rock

挤压性围岩隧道施工时变形量大、变形速率高、持续时间长,易发生变形侵限、拆换等现象,施工进度缓慢,安全风险极高。结合兰新铁路乌鞘岭、兰渝铁路木寨岭等挤压性围岩隧道修建经验,通过数理统计分析,提出了基于挤压性围岩判别标准、变形潜势分级、变形等级划分、荷载计算公式的变形分级设计与施工方法。

Great amount of deformation,fast deformation rate,and longtime duration of deformation often occur in the construction of tunnels with squeezing surrounding rock.These may lead to clearance infringement and replace-ment.They slow down the construction process and greatly increase the safety risk.In combination with the construction experience of tunnels with squeezing surrounding rock such as the Wushaoling Tunnel of Lanzhou-Xinjiang Railway and the Muzhailing Tunnel of Lanzhou-Chongqing Railway,etc.,this paper has proposed with mathematical statistical analysis the design and construction methods of deformation grade based on the criterion to identify squeezing sur-rounding rock,grading of deformation potential,classification of deformation grade,and calculation formula of load.