摘要
过水围堰因其适用范围广且节约资源和工期等优点而被广泛应用,但在大单宽流量条件下,围堰过水后围堰下游防冲难度较大,因而提出在镇墩上加设微型挑角鼻坎的围堰堰后冲刷控制方法,并进行了体型优化模型试验。结果表明,通过控制镇墩上加设的微型挑角鼻坎挑角使出堰主流略微上抬,不仅可以减轻河道底部冲刷和河面波浪,也能使优化体型过水围堰下游面板的脉动压力达到要求,且不会产生空蚀空化及流激振动的问题,还节省了制作铅丝笼的费用,是非常经济实用的体型设置。
Overflow cofferdam is widely used for its wide field of application and saving resources as well as time limit for a project.However,in the condition of large unit width discharge,after water flowing through the upstream cofferdam,the difficulty of defensive protection of cofferdam is very large.This paper proposes a new method to control the erosion of channel behind the upstream cofferdam：using small-angle bucket on the anchorage block.The test results prove that controlling the angle of small-angle bucket on the anchorage block can make main flow have a slight raise,which can not only lighten the erosion of channel and surface wave,but save the cost of protection gabion.The fluctuating pressure of overflow cofferdam in the downstream can also meet the requirements,which may not endure problems of cavitation and flow induced vibration as well as save costs of wire box,which is economical and practical type to use.
出处
《水电能源科学》
北大核心
2015年第1期84-86,19,共4页
Water Resources and Power
关键词
大单宽流量
过水围堰
抗冲性能
体型优化
模型试验
large per unit width discharge
overflow cofferdam
impact resistance property
shape optimization
model test
