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拱坝坝身对冲式溢洪道,就是在拱坝左右两侧的一段坝身上及此段坝身向下游沿地形的延伸部分,各设具有挑流鼻坎的溢洪道。它的特点在于利用两侧溢洪道的挑流水舌在空中对撞而消能。本文介绍了拟定这种溢洪道主要尺寸的主要依据和详细步骤;据此,即可初步定出对撞消能比较充分,而且对坝趾附近和下游的两岸岸坡冲刷影响较小的对冲式溢洪道方案。文中还举例说明这一方法并与原有的室内试验成果作了验证比较。
Dam dam body hedge spillway is in the arch dam on both sides of a section of the dam body and downstream of this section of the dam body along the terrain extension, each with a nose ridge spillway. It is characterized by the use of both sides of the spillway pick-up water tongue in the air collision and energy dissipation. This paper presents the main basis and detailed steps for formulating the main dimensions of this spillway. Based on this, we can initially set out the hedge spillway that has fairly sufficient energy dissipation and relatively little impact on the bank slope near and downstream of the toe, Program. The paper also illustrates this method and compares it with the original indoor test results.