观音峡水电站引水隧洞设计方案分析

Analysis of Guanyinxia Hydropower Station Diversion Tunnel Design Program

无压隧洞是引水发电站常采用的引水工程。本文以观音峡水电站无压输水隧洞作为工程背景,介绍了观音峡水电站及其引水隧洞的工程概况,在此基础上,分析了隧洞线路方案比选和隧洞结构形式比选,并对隧洞过水能力和衬砌结构受力安全进行了验算。结果表明,采用左岸引水隧洞,选用城门形式的无压引水隧洞结构形式,在技术、经济指标等方面优势明显;隧洞的衬砌结构受力和过流能力满足设计要求。

Tunnel without water pressure is water diversion project which is often used in water diversion power stations. Water diversion tunnel without pressure in Guanyinxia Hydropower Station is adopted as project background in the paper. Project overview of Guanyinxia Hydropower Station and water diversion tunnel thereof are introduced. Tunnel line program comparison and tunnel structure form comparison are analyzed on the basis. Tunnel water flowing ability and lining structure force are verified. The result showed that the advantages of adopting water diversion tunnel on left bank and selecting gate- type water diversion tunnel structure form without pressure in the aspects of technical and economic indicators, etc. are prominent. The tunnel lining structure force and flowing ability can meet the design requirements.