古水水电站放空冲沙洞掺气减蚀研究

Study on Aeration and Erosion Reduction of Drainage Sand-scouring Tunnel in Gushui Hydropower Station

高水头大泄量泄洪隧洞常因空蚀而遭到破坏,古水水电站放空冲沙洞最大水头175.4m,最大泄量2 100m^3/s,且隧洞布置受下游滑坡堆积体影响,隧洞长度较长,底坡较小,掺气难度较大。对古水水电站放空冲沙洞掺气设施设计及模型试验、抗冲耐磨混凝土材料、过流面不平整度控制进行介绍。

High head and large discharge tunnel is often destroyed by cavitation erosion. Gushui Hydropower Station empties sand-washing tunnel with maximum head of 175.4 m and maximum discharge of 2100 m^3/s. The tunnel layout is affected by downstream landslide accumulation. The tunnel length is longer, the bottom slope is smaller, and aeration is more difficult. This paper introduces the design and model test of aeration facilities, erosion-resistant and wearresistant concrete materials, and the control of irregularity of flow surface of Gushui Hydropower Station.