烟台山大跨度小间距隧道施工方法的选用分析

Analysis on Construction Methods of Large Span and Small Spacing Tunnel of Yantai Mountain

为了选取合适的施工方法,保证大跨度小净距隧道的施工安全,以市琅岐环岛路西北段烟台山隧道为工程背景,开展了隧道合理施工方法选用分析。通过Ⅴ级围岩采用双侧壁导坑法和Ⅳ级围岩采用中隔壁法施工,对施工过程中的拱顶沉降、水平收敛、地表沉降等进行了数据分析。结果表明:Ⅴ级围岩采用双侧壁导坑法和Ⅳ级围岩采用中隔壁法,隧道周边收敛、拱顶沉降和地表下沉均未超过限定值,说明选用的开挖方法合理。

In order to select the appropriate construction method,ensure the construction safety of large span tunnel with small spacing,based on Fuzhou Yantai Mountain tunnel project,analysis on selection of the reasonable construction method of tunnel is carried out,by using the double side drift method for class V surrounding rock and CD method for class IV surrounding rock,data analysis is carried out on the vault settlement,horizontal convergence and surface subsidence in the construction process. The results show that by using the above method,the tunnel peripheral convergence,vault settlement and surface subsidence do not exceed the limit value,indicating that the selected excavation methods are reasonable.