软弱夹层,流砂、涌水等复杂多变的地质条件下,输水隧洞施工中岩体自稳性差,边墙拱顶容易变形经常会出现坍塌、冒顶等工程质量及安全事故。本文结合牛营隧洞开挖过程中成功穿越软软弱夹层段的开挖程序、钻爆参数、支护措施、施工程序的实例,探讨了软弱夹层段施工的有效方法,希望能为同类隧洞施工提供参考。 Under the complex and changing geological conditions such as weak sand, flowing sand and gushing water, the rock mass self-stability in the construction of water conveyance tunnels is poor, and the vaults on the side walls are prone to deformation, often resulting in engineering quality and safety accidents such as collapse and roof fall. Based on the successful excavation procedure, drilling and blasting parameters, support measures and construction procedures in the tunneling process of Niuying Tunnel, this paper discusses the effective methods for the construction of soft interlayer sections and hopes to provide the similar tunnel construction reference.