硬质破碎岩体中隧道锚肋组合支护体系的构想

An Idea for Anchor and Steel Rib Combined Tunnel Support System in Hard Broken Surrounding Rock

硬质破碎岩体中隧道的支护通常采用提高支护刚度的设计思路,虽然该方案在一定程度上可避免施工风险,但也存在着无法有效利用围岩自承能力、初期支护大变形、二次衬砌开裂甚至破坏等一些问题,影响隧道的使用安全。基于以上背景,通过研究提出一种新的适用于不良地质条件中隧道的支护思路和方法,即采用"锚杆+内压(支撑)构件"形成锚肋组合支护体系作为围岩加固手段,代替传统的高支护刚度策略。构想通过理论推导、数值仿真、模型试验和现场试验等手段,研制形成适用于硬质破碎岩体中隧道的柔性支护。

The tunnel design of improving support system stiffness is often used in hard broken surrounding rock. Although this method can avoid the construction risk to a certain extent, there exist some problems such as inability to effectively use the self-bearing capacity of the surrounding rock, large deformation of the primary support, cracking or even destruction of the secondary lining, thus affecting the safety of tunnels. Based on the above background, a new idea or method of tunnel support for poor geological conditions is proposed in the reaearch. It uses the ＂anchor ＋ internal pressure（support）member＂ to form the anchor-rib combined support system as the reinforcement of surrounding rock and thus to replace the traditional high support stiffness strategy. The idea develops a flexible support for the tunnel in hard broken surrounding rock by meas of theoretical derivation, numerical simulation, model test and field test, laying a theoretical foundation for further expanding the tunnle construction technology under adverse geological conditions.