带微桩支撑的长大管棚在隧道进洞中的应用

Long Pipe Shed Construction Technology in Weak Surrounding Rock of the Ganntas Tunnel

甘塔斯隧道是阿尔及利亚55 km铁路复线项目的控制工程,隧道进出口是泥灰岩地段,属软弱围岩。进洞采用长大管棚预支护方案,配以微桩支撑。施工中严格遵守操作步骤及施工要点,保证了施工作业的安全,取得了进洞的成功。

Ganntas Tunnel is the controlling engineering of the 55 kilometers double tracks railway project in Algeria. The entrance of the tunnel is composed by the marlite, which is considered as soft wall rock. The precept of the advanced supporting by using large tube sheds assisted by micro-piles is adopted in the construction to enter the tunnel. It is strictly demanded to follow the operation procedure and kernel requirements, which ensure the safety of construction works and the success to enter the tunnel.