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截流工程是水电工程建设极其重要的环节。针对截流时龙口水力学指标过高,抛投料流失严重的问题,结合某工程实例,通过模型试验对比研究了S型龙口、S型龙口和导沙坎开孔、河床加糙、拦石栅立体加糙四种截流方式的水力学指标变化规律。结果表明,拦石栅立体加糙方案的龙口落差减少率、龙口流速减少率以及龙口单宽功率减少率分别为10%、30%、20%,此外,该方案还能有效减小抛投料流失率,尤其是大块石料等人工特殊料使用量减少率高达67%,大大降低了施工难度和成本。这种方式尤其适用于龙口落差大、流速快、单宽功率大且大块石缺乏的工程。
Closure engineering is an extremely important link in the construction of hydropower projects. Aiming at the problem that the hydraulics index of Longkou is too high and throwing material is seriously lost during the interception, a series of experiments have been carried out to study the S-type Longkou, S-type Longkou and Doushakou openings, Variation of Hydraulic Index of Four Closure Methods with Roughness. The results show that the reduction rate of Longkou drop, Longkou flow rate reduction and Longkou single-width power reduction rate are respectively 10%, 30% and 20% for the three-dimensional plus-roughening project of rock-fill gratings. In addition, this scheme can effectively reduce the loss of dumped material The rate of reduction of the use of artificial special materials, especially large stones, is as high as 67%, greatly reducing the difficulty and cost of construction. This method is especially suitable for Longkou drop large, fast flow rate, single wide-power and lack of large stone project.