大岗山水电站引水发电系统设计

Diversion and Power Generation System Design of Dagangshan Hydropower Station

大岗山电站地下厂房规模较大,地质条件复杂,地震基本烈度高,引水发电系统设计中的重大技术难点主要有:引水线路短需空间独立布置、进水塔地震烈度高需设置抗震措施及高边坡规模较大、压力管道内水压大、大型地下厂房洞室群稳定、β80和β81岩脉段处理、岩锚梁结构选形、尾水洞出口位置及形式与围堰施工矛盾等。设计中根据地形地质条件、机电设备资料、枢纽布置、施工条件、运行和维护条件、工程投资等因素,对以上问题进行分析研究,提出了技术可行、经济合理、施工方便、便于运行管理的工程方案。

Because of large scale caverns, complex geological environment and high basic seismic intensity of underground powerhouse system of Dagagnshan Hydropower Station, more technical difficulties need to be solved in the design of diversion and power generation system, which mainly include individual arrangement of shorter diversion system, seismic measures for intake tower, large scale treatment of intake slope, high internal water pressure of diversion tunnel, stability of large scale underground caverns, 13s0 and 13Sl dikes treatment measures, rock anchor beam structure selection, location and structure of tailrace tunnel outlet and contradiction between cofferdam and tailrace tunnel outlet construction. According to geological conditions, electrical equipments, hydraulic structure arrangement, construction conditions, operation and maintenance conditions and project investment, these major technical difficulties are analyzed, and the solution which is feasible in technology, reasonable in economy, convenient in construction and easy in operation and management is also proposed.