挑流消能在狭窄泥岩河谷中的应用

Application of Flip Bucket Energy Dissipation in Narrow Mudstone River Valley

在下游河道狭窄、泥岩抗冲流速小等不利地质地形条件下,依托实际工程,采用模型试验方法研究了有、无水垫塘条件下不同的泄洪洞挑坎体型,并比较了挑流水舌的空中形态、河床冲刷位置及深度、水垫塘中水流流态、底板冲击动压及水垫塘消能率等特征水力指标。结果表明,在基岩抗冲流速小、单宽流量大、天然水深较浅的河谷中,采用燕尾坎+水垫塘的组合消能工方案是可行的,为挑流消能在低抗冲流速基岩中的应用提供了新途径。

Under the unfavorable geological and topographical conditions such as the narrow downstream river channel and the mudstone foundation with low resisting flow velocity, based on the practice engineering, the hydraulic indicators under the condition of with or without a plunge pool was compared via scale model test. Such hydraulic indicators include flow pattern, depth and location of scour, flow regime, impact pressure, and energy dissipation efficiency in plunge pool. The results show that it is feasible to combine swallow-tailed flip bucket and plunge pool to dissipate energy under the above unfavorable conditions, which provides a new way for application of flip bucket energy dissipation in mudstone foundation with low resisting flow velocity.