湖南省芦江水库溢流坝台阶和戽流组合消能设计

Design of steps and bucket flow combined energy dissipation for overflow dam in Lujiang Reservoir of Hunan Province

为了研究芦江水库工程溢流坝采用台阶+消力戽组合消能的可行性,结合工程特点,经综合分析大坝溢流面台阶+戽流组合消能和台阶+消力池组合消能2个方案,最终选择消能效果好、投资省的台阶+戽流组合消能方案。介绍了溢流坝面消能台阶步高和步长及消力戽尺寸拟定的方法、溢流坝面经过台阶水流流态、消能率及戽流消能等的水力学计算和水工整体模型试验。结果表明:计算和试验结果较为吻合,该工程溢流坝采用台阶+戽流组合消能是合理可行的。

To study the feasibility of steps and bucket flow combined energy dissipation for overflow dam in Lujiang Reservoir,considering the characteristics of this project,two schemes,including steps and bucket flow combined energy dissipation and step and stilling basin combined energy dissipation,were analyzed comprehensively.The steps and bucket flow combined energy dissipation scheme was selected for its good energy dissipation effects and low investment.The methods for height and length design of the steps and size determination of energy dissipation bucket on overflow dam surface,and the hydraulic calculation and model test for the state,energy dissipation rate and bucket energy dissipation of the flow passing the steps on the overflow dam were demonstrated.It showed that the results of hydraulic calculation and physical experiment were consistent,so the design of steps and bucket flow combined energy dissipation was reasonable and feasible.