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河道截流是水电工程建设过程中的控制性节点工程,实际截流工程中发现,增加抛投强度可以显著减少抛投料的流失,从而实现安全截流。从单位时间龙口水流的冲刷能力与抛投料的抗冲能力之间的平衡观点出发,该文提出了水流极限冲刷值的概念。对不同粒径条件下的水流极限冲刷值进行实验,由实验结果得出其经验公式,在此基础上提出:实际截流中的抛投强度大于合龙过程中的最大水流极限冲刷值便可顺利合龙。同时截流抛投强度与抛投料流失量之间的实验结果表明:在相同块石粒径的情况下,随着抛投强度的增加,块石流失量逐渐减小;当抛投强度达到一定强度后,流失量减小的速度逐渐放缓;在相同抛投强度下截流,抛投材料的粒径越大流失量越小。
The river closure is a controlled node project in the construction of hydropower projects. In the actual river closure project, it is found that increasing the throwing intensity can significantly reduce the loss of material to be dumped, so as to achieve safety closure. From the viewpoint of the balance between the flushing ability of Longkou water flow per unit time and the throwing ability of the cast material, this paper presents the concept of the limit value of water flow. Based on the experimental results, the experimental results show that the throwing strength in the actual cutoff is greater than the maximum flow scouring value in the process of closing, which can be successfully closed . At the same time, the experimental results between cut-off throwing throwing strength and throwing throwing loss show that with the same block diameter, the loss of block rock decreases with the increase of throwing strength. When the throwing strength reaches a certain intensity After that, the rate of loss decreased gradually. Under the same throwing intensity, the larger the particle size of the throwing material, the smaller the amount of loss.