浅埋、偏压、软岩隧道进洞施工技术研究

浅埋、偏压、软弱围岩隧道进洞施工一直是隧道施工的难点,通过实例介绍此类隧道施工关键技术,采用重力式挡墙和边仰坡加固措施处理隧道偏压,采用大管棚、超前小导管及套拱法处理隧道浅埋,采用三台阶七步流水法进行软弱围岩洞内施工,同时阐述施工过程中监控量测的方法和对围岩变形的处理措施。

Construction of Tunnels with Shallow Depth,Unsymmetrical Loading and Soft Rock

Excavation in shallow depth,unsymmetrical loading and soft rock tunnel remains a challenge in tunnel construction.This paper introduces construction practices in shallow depth,unsymmetrical loading and soft rock tunnels.The gravity retaining wall and the consolidation of side and front slopes are used to treat unsymmetrical loading,and large pipe shed,advanced small pipe and overlap arch way are employed to deal with shallow depth.Three-stage-and-seven-step flowing method is applied in the tunnel with soft rock.Meanwhile,the monitoring and measuring methods,the treatment of surrounding rock deformation are elaborated.