钢筋笼砌石与混凝土护坦水流特性对比试验研究

通过水工模型试验,研究了平原河道柔性钢筋笼砌石护坦及混凝土护坦2种结构下的消力池、海漫段的水流结构特性。从过流能力、过堰水流的水面线、水流形态、消力池及海漫段断面垂线流速、消能率等方面,对比分析了2种护坦型式下水力学要素的区别。试验结果表明:钢筋笼砌石柔性护坦较混凝土护坦而言,其过流能力略低于混凝土护坦,但从堰后水跃形态、水面线变化、消力池内垂向流速分布、消能率等方面均优于刚性混凝土护坦。采用柔性钢筋笼砌石护坦,可有效降低消力池内水流底层流速,从而可减缓水流对消力池底部的冲刷。

Contrast study of flow characteristics,between the flexiable steel reinforcement masonry cage apron and concrete apron

Through hydraulic model test, the flow characteristics in flat fiver with flexible apron which is made of steel reinforcement cage masory and concrete apron is respectively studied in this paper. Some hydraulic elements have been developed, which includes flow capacity , water profiles, hydraulic jump, velocity distribution in perpendicular direction and energy dissipation rate. The results indicate that compared with the concrete apron, the flexible steel reinforcement cage apron has a modicum advantage in flow capacity, but has disadvantage in morphology of hydraulic jump, changes of water profiles, the perpendicular velocity distribution and the energy dissipation rate. Applied in the flexible apron, it will reduce the bottom velocity in absorption basin, so it can retard the scouring to absorption basin bottom.