陕北地区某引水工程支线输水隧洞断面设计分析

Analysis on Sectional Design of Water Delivery Tunnel for Branch Line of a Water Diversion Project in Northern Shaanxi

隧洞作为引水工程中常见的主要建筑物,断面设计是很重要的一个环节,不仅要考虑到运行期的过流能力,也要考虑施工条件和工程投资。该文以陕北地区某引水工程支线段隧洞设计为例,从地质条件、水力参数、工程量和投资进行计算分析,选择出易于施工开挖,水利条件较好并且投资节省的圆拱直墙型断面作为该工程的推荐断面。最后,对其衬砌断面结构内力进行了计算,可供施工人员参考。

As a common main building in water diversion projects,the cross-section design of a tunnel is a very important part,which considers not only the flow capacity during the operation period,but also the construction conditions and project investment.Taking the tunnel design of a branch line of a water diversion project in northern Shaanxi as an example,this paper made a computational analysis of geological conditions,hydraulic parameters,engineering volume and investment,and thus selected the section with circular arch+straight wall as recommended for this project,which is easy to construct and excavate,with excellent water conservancy conditions,and saves investment.Finally,the internal force of its lining section structure was calculated for the reference of construction personnel.