杨房沟水电站导流隧洞工程布置及结构设计

杨房沟水电站导流隧洞具有导流与度汛流量大、流速快、水位变幅大、洞身断面较大、使用年限长等特点。导流建筑物一旦失事将推迟大坝的施工进度和发电工期,造成重大灾害和损失。综合当地地形地质条件、洪水特性、枢纽布置及工程特点,介绍了导流隧洞的布置及断面型式、导流隧洞水力学计算结果、进出口及洞身支护、进口闸门井及堵头等结构的设计方案。导流隧洞进口闸门室结构计算表明:在各运行工况下,建筑物满足安全运行要求;基础地质缺陷处理和边坡处理满足规范规定的稳定安全系数要求。

Study on layout and structural design of diversion tunnel in Yangfanggou Hydropower Station

The diversion tunnel of Yangfanggou Hydropower Station is characterized as large flow during diversion and flood period, fast flow, large water level variation, large tunnel cross-section and long lifetime. Once diversion structure accident takes place, the dam construction schedule and power generation deadline will be postponed, which may cause severe disasters and losses. In the combination with local topographic and geological conditions, flood characteristics, project layout and engineering characteristics, the diversion tunnel layout, cross-section form, hydraulic calculation results of the tunnel, inlet and outlet support, design schemes of structures like inlet gate shaft and tunnel plug are introduced in this paper. The calculation of inlet gate shaft showed that the structure met the requirements of safe operation and that foundation geological defect treatment and slope treatment complied with the stability safety coefficient of related standard. 