隧道软弱围岩中双层小导管超前支护的施工技术

Construction Technology of Double-layer Small-duct Forepoling in Weak Surrounding Rock of Tunnel

在隧道工程施工过程中,经常会遇到软弱围岩地层,为了避免出现开挖失稳的情况,一般会使用双层小导管超前支护技术进行注浆加固。以三阳隧道为例,从施工准备、小导管设计、注浆施工、注浆异常处理等几个方面对双层小导管超前支护施工技术进行了探讨。

The weak surrounding rock stratum often appears in the tunnel engineering construction. In order to avoid the situation of excavation instability, the double-layer small-duct forepoling technology is generally used for the grouting reinforcement. Taking Sanyang Tunnel as an example, the article discusses the double-layer small-duct forepoling construction technology from the construction preparation, small-duct design, grouting construction and abnormal grouting treatment.