斜护坦联合裙板消能工设计与试验验证

以多沙河流上某泄洪闸工程为例,基于斜护坦+裙板冲坑深度计算公式设计该泄洪闸下游消能工。试验验证表明,斜护坦和裙板设计基本合理,消除了水流顶冲和集中水流跌落现象,改善了河道冲淤形态,保证建筑物基础安全。分析河道冲淤形态及形成过程,发现拦河闸下游护坡需尽量与拦河闸同宽且顺应原河道走势,不宜束窄河床也不能过多扩散;限冲隔墙对保护河道长距离冲刷作用显著,但在水流集中的河段可能会引起水流跌落,淘刷隔墙基础;冲坑深度随来流量的增大逐渐加深,随下游水深的增加逐渐减小,两者相互制约,影响下游河道冲淤形态,可为类似工程设计提供参考。

Design and Experimental Verification of Energy Dissipator for Oblique Apron and Apron Board

Taking a flood gate project on a sandy river as an example, the downstream energy dissipator of the flood gate is designed based on the formula for calculating the depth of the inclined apron + skirt shovel. Test verification shows that the design of the slope protection apron and skirt board is basically reasonable, eliminating the phenomenon of water flow rushing and concentrated water flow drop, improving the shape of the river channel erosion and silting, ensuring the safety of the building foundation. By analyzing the channel erosion shape and forming process, it finds out that the downstream slope protection of the sluice should be kept the same width with the barrage, and conform to the trend of the original river channel. It should not be narrowed and the river bed should not spread too much. The impact-restricting partition wall has a significant effect on the long-term erosion of the protection channel, but in the river section where the flow is concentrated may cause water flow to fall and scour the foundation of the partition wall. The erosion depth gradually increases with the increase of the flow rate and gradually decreases with the increase of the downstream water depth. The two restrict each other and affect the erosion and siltation pattern of the downstream channel. Thus, this study can provide a reference for the similar engineering design.