南宁市第二水源输水隧洞施工支洞布置规划

Construction adit layout planning for water conveyance tunnel of Nanning Second Water Source Project

南宁市第二水源工程是环北部湾广西水资源配置工程子项目之一。本项目共包括那板水库向凤亭河水库调水工程及凤亭河水库向大王滩水库调水工程两部分。那板水库向凤亭河水库调水工程的输水设计流量为11 m3/s,隧洞洞线总长为8143 m,断面尺寸为3.5m×4.0 m城门洞型,隧洞洞挖施工拟采用“钻爆法”施工方案。本文从施工支洞数量、位置的选择及确定等方面进行分析,对施工支洞进行合理规划布置。

As one of the subprojects of Guangxi Water Resources Allocation Project around Beibu Gulf,Nanning Second Water Source Project consists of two components including the water diversion work from Naban Reservoir to Fengtinghe Reservoir and the water diversion work from Fengtinghe Reservoir to Dawangtan Reservoir.The water diversion work from Naban Reservoir to Fengtinghe Reservoir has a design flow of 11m'/s,a 8143m-long overturn U-shape tunnel dimensioning 3.5mx4.Om.The tunnel excavation is planned to be carried out by drilling and blasting method.The layout planning of construction adits was conducted based on analysis of the adit quantity and arrangement.