软弱围岩大变形隧道施工技术探讨

Discussion on Construction Technology of Tunnels with Large Deformation and Weak Surrounding Rock

隧道作为交通工程施工中主体结构之一,对缩短线路距离、改善运行条件等都具有突出作用。而我国地形条件复杂,在施工过程中常会遇到构造影响强烈、节理裂隙发育、挤压和蚀变等地质条件,造成隧道在施工过程中围岩出现大变形开裂的现象,严重影响施工质量和安全。为此,超前掌握施工区域地质条件,采用科学合理的开挖支护手段对容易发生大变形区域进行控制,避免出现因地质条件影响隧道围岩出现大变形、坍塌等,是保证隧道施工安全的关键。

As one of the main structures in traffic engineering construction,tunnels play a prominent role in shortening the distance of lines and improving operating conditions.However,China’s topographic conditions are complex,and geological conditions such as strong structure influence,joint fissure development,extrusion and alteration are often encountered in the construction process,resulting in large deformation and cracking of the surrounding rock during the tunnel construction,which seriously affects the construction quality and safety.Therefore,it is necessary to grasp the geological conditions at the construction area in advance,control the area that is prone to large deformation by using scientific and reasonable excavation support means,and avoid the occurrence of large deformation and collapse of the surrounding rock of the tunnel due to the influence of geological conditions,which are the key to ensure the safety of tunnel construction.