过水围堰消能平台水垫池水力试验研究

发布时间：2018-10-16 12:02

【摘要】：针对过水围堰消能防冲特征,提出在消能平台上设置水垫池的方法。通过专门的水力试验装置对消能平台水垫池进行研究,并与无水垫池时的水力特性对比分析。研究表明:水垫池的设置相当于增加了水垫深度,特别在下游基坑水位相对较低、消能平台水深较浅时,可明显改善消能效果;消能平台出口流速较无水垫池时明显降低,能减轻水流对下游护面及堰脚的冲刷;与无水垫池时底板压力峰值出现在消能平台进口附近不同,设有水垫池时压力峰值出现在尾坎附近,可有效缓解消能平台进口的冲击力。采用合适的消能平台水垫池结构,可提高消能防冲作用、改善底板受力条件,有利于过水围堰安全溢洪。
[Abstract]:In view of the characteristics of energy dissipation and scour prevention of overflowing cofferdam, the method of setting water cushion pool on energy dissipation platform is put forward. The water cushion pool of energy dissipation platform was studied by a special hydraulic test device, and the hydraulic characteristics of the platform were compared with those without water cushion pool. The results show that the setting of water cushion pool is equivalent to increasing the depth of water cushion, especially when the water level of downstream foundation pit is relatively low and the water depth of energy dissipation platform is shallow, the energy dissipation effect can be improved obviously, and the velocity of outlet velocity of energy dissipation platform is obviously lower than that without water cushion pool. It can reduce the erosion of downstream protection surface and Weir foot by water flow, and the peak value of bottom plate pressure appears near the inlet of energy dissipation platform when there is no water cushion pool, and the peak value of pressure appears near the end ridge when water cushion pool is installed, which can effectively alleviate the impact force of energy dissipation platform inlet. Adopting the suitable structure of water cushion pool of energy dissipation platform can improve the energy dissipation and anti-scour effect, improve the stress condition of the bottom plate, and benefit the safe flood spillage of the water cofferdam.
【作者单位】：四川大学水利水电学院;四川大学水力学与山区河流开发保护国家重点实验室;
【基金】：国家自然科学基金资助项目(51109149,51309172)
【分类号】：TV653

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