大变形隧道力学效应及施工对策

Mechanics Effect and Construction Countermeasures of Large Deformation Tunnel

在软弱围岩中修建隧道,围岩及隧道结构如初期支护和二次衬砌都遵循大变形理论,因此设计和施工都应该以"大变形"理论为指导,进行设计施工。通过大变形理论分析得出,隧道施工必须以"新奥法"隧道施工理论为指导,切实搞好隧道围岩预加固、分部、分台阶开挖,以确保软弱围岩隧道在施工过程中的安全,通过"大变形"理论为指导,加强监控量测,使得施工过程中整个隧道始终处于安全可控制状态。

The surrounding rock and the tunnel structure, i.e. the preliminary supporting and secondary lining should follow the large deformation theory if the tunnel is built in weak surrounding rock. Therefore, the design and construction are implemented according to the large deformation theory. The theoretical analysis shows that the tunnel construction must be directed by the tunnel construction theory of 'New Austrian Tunneling Method', and the surrounding rock of tunnel should be pre-reinforced better and be excavated by sections and steps so as to ensure the safety of weak surrounding tunnel in the construction process. According to the large deformation theory, it is to strengthen the monitoring measurement to make the whole tunnel be at the safe controllable state all the time in the construction process.