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本文叙述洪都拉斯El Cajon水电工程中建议采用的堆石围堰的水力学研究。该围堰设有钢板桩截水墙,下游面用铠装的石笼保护。文中提供了试验数据、结果及设计概念。洪都拉斯El Cajon水电站设计方案的主坝为高225米的拱坝。该坝将形成面积为94平方公里的水库,总库容5700×10~6立米。水库将作为多年调节水库运用。在施工期间,Hamuya河将通过位于河谷右岸的直径为13米的隧洞导流。为经济起见,施工区将分別用高40米和15米的上下游围堰保持干燥。工程设计不允许导流隧洞宣泄40年一迁的4500立米/秒的洪水量。当泄量超过2100立米/秒时,围堰将漫顶。所以围堰必须设计成能经受住这种情况。
This article describes the hydraulics study of rockfill cofferdam proposed in El Cajon Hydropower Project in Honduras. The cofferdam has a steel sheet cut-off wall, the downstream face with armored gabion protection. The article provides experimental data, results and design concepts. The main dam for the design of El Cajon Hydropower Station in Honduras is an arch dam of 225 meters in height. The dam will form an area of 94 square kilometers of the reservoir, with a total capacity of 5700 × 10 ~ 6 cubic meters. The reservoir will serve as a multi-year regulation reservoir. During construction, the Hamuya River will be diverted via a 13-m-diameter tunnel on the right bank of the valley. For economic reasons, the construction area will be kept dry by the upper and lower cofferdams with a height of 40 meters and 15 meters respectively. Engineering design does not allow diverting tunnels to vent floods of 4,500 mph in 40 years. When the discharge of more than 2100 m / s, cofferdam will be top. Therefore, the cofferdam must be designed to withstand this situation.