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鲁布革水电站溢洪道紧靠心墙堆石坝的左坝肩,为开敞式,分为两孔,每孔净宽13m,全长约550m。溢洪道泄流量为4,740m~3/S(校核洪水)及6.459m~3/S(保坝洪水),占首部枢纽总泄量的55～62%,是首部枢纽的主要泄洪建筑物。目前溢洪道已全面开挖,1,122m高程以上边坡已形成,并正在向下继续开挖。从边坡开挖至今的情况看,设计所采用的直边坡方案是成功的。现将该边坡设计、施工中所碰到的几个问题介绍于后。
The Lubuge Hydropower Station spillway is close to the left abutment of the core rockfill dam. It is an open style and is divided into two holes with a net width of 13m and a total length of about 550m. Spillway discharge of 4,740m ~ 3 / S (check flood) and 6.459m ~ 3 / S (dam flood), accounting for 55 ~ 62% of the total discharge of the first hub, is the first hub of the main flood discharge structures. At present, the spillway has been fully excavated, and slopes above 1,122m have been formed and excavation is continuing downward. From the excavation of the slope up to now, the design of the straight slope program is successful. Now the slope design, construction encountered several problems introduced later.