高地应力软弱围岩隧道挤压型变形和可让性支护原理

Tunneling in Squeezing Ground with Yielding Supports

软弱围岩深埋隧道修建遇到的挤压型围岩大变形问题,是山岭隧道工程中的难题。文章在对挤压型变形机制、判识方法和变形特征进行分析的基础上,介绍了挤压型变形围岩支护的可让性原则,从地层特征曲线和支护-围岩相互作用出发,阐述了可让式支护的原理并给出了相关的设计施工要点。

Tunneling in squeezing ground often involves difficult problems, especially in the case of a deep tunnel with high overburden and weak rock conditions. Following an outline of the fundamental mechanisms of squeezing as well as its identification and ground deformation characteristics, a yielding principle for tunneling under squeezing rock conditions is introduced and some key points for design and installation of the yielding supports are presented.