浅谈隧道工程单向掘进双层小导管支护出洞工法

Discussion on the Tunneling Approach with Single Direction Tunneling and Supporting of Two-layered Ductules

以大连市高新园区风采路大石洞隧道单向掘进出洞方案为实例,介绍了在隧道工程中洞口地质及环境条件受限条件下,超前支护采用双层小导管,小导洞先出洞再进行分部扩挖的施工工法,并对此工法在施工过程中遇到的问题及注意事项进行分析探讨,为类似隧道工程施工提供参考。

Taking the example of the single direction tunneling program of Dashidong Tunnel at Dalian High- tech Park Fengcai Road,it introduces the construction approach performed by using two- layered ductules as the advanced support and letting the small pilot tunnel before partly expanding excavation under the constrained geological and environmental conditions during tunnel construction. Besides,it provides analysis and discussion on the problems and matters need attention when constructing with this approach,which gives a reference for the construction of such tunnels.