小净距分离式曲线隧道施工方案研究

The Study on Construction Plan of the Small Clearance Separated Curved Tunnel

连续中、短隧道在特殊地段的施工中,因地形限制常采用小净距隧道或连拱隧道型式,隧道围岩稳定性的控制就成为小净距隧道的关键,尤其是中夹岩岩体稳定性就显得非常重要,通过对小净距分离式曲线隧道施工关键技术研究,总结施工支护、开挖方法、中夹岩加固、单向掘进出洞方式等,对同类工程具有一定的指导意义。

During the construction of continuous medium and short tunnels in special areas,due to the terrain restrictions,the small clearance tunnel or arch tunnel is generally applied.the stability control of surrounding rock masses,especially the wall of rock in neighborhood tunnel,becomes the key of small clearance tunnel.Through the research of the key construction technologies of the small clearance separated curved tunnel,this paper summarized the methods such as construction support,excavation method,the wall of rock in neighborhood tunnel reinforcement and one-way tunneling,and provided certain guiding significance.