不良地质条件下浅埋隧洞大高差变径交叉段施工技术

Construction Technology of Shallow Tunnels at Reducing Intersection Part with Large Height Difference under Adverse Geological Conditions

长距离隧洞施工时往往需要设置辅助坑道,如竖井、支洞、斜井等,用以增加洞挖掘进工作面、加快施工进度、改善洞挖作业条件.交叉口作为辅助坑道与主隧洞相交的部位,其施工安全质量尤为重要.以引绰济辽工程为例,介绍了不良地质条件下浅埋隧洞大高差变径交叉口开挖支护施工工艺及要点,所取得的经验可为今后类似工程参考.

In the long-distance tunnel construction,auxiliary tunnels,such as shafts,adits,inclined shafts,etc.,are often needed to increase the tunnel excavation workface,speed up the construction progress and improve tunnel excavation work conditions.As the intersection of auxiliary tunnel and main tunnel,the construction safety and quality is particularly important.Taking the Project of Diverting Water from Chaoer River to Xiliao River as an example,the paper introduces the construction technology and key points of excavation and support of shallow tunnel with large height difference and reducing intersection under adverse geological conditions.The experience obtained can be used as reference for similar projects in the future.