杨房沟水电站大江截流设计与施工

Design and Construction of the River Closure of Yangfanggou Hydropower Station

杨房沟水电站为我国第一个以设计施工总承包模式建设的百万千瓦级大型水电工程,大江截流具有水力学指标适中、河床纵坡较陡、抛投强度高、交通条件差的特点。通过设置分流堤将导流隧洞分流比由34%提高至54%,在最困难的Ⅲ区段抛投钢桁架石笼进行垫底防冲,对截流成功起到了关键作用。

As the first mega-k W class hydropower project constructed in the design-construction general contracting mode in China,the river closure work of Yangfanggou Hydropower Station is of certain characteristics such as the moderate hydraulic index,steep longitudinal riverbed slope,high throwing intensity and poor traffic condition. Thus,a diverting levee is constructed to increase the flow diversion percentage of the diversion tunnel from 34% to 54%. Also,steel-truss rock cages are dumped on the riverbed for scouring protection. Practice shows that these measures play important roles for the success of the river closure.