过水围堰混凝土面板水流脉动压力试验研究

Model Test of Fluctuating Pressure on Concrete Facing Plate of Overflow Cofferdam

针对过水土石围堰泄流时水流脉动压力作用对混凝土面板稳定非常不利的问题,以功果桥围堰为例,做了多个流量下的模型试验,获得了脉动压力强度等脉动压力特征值和脉动压力功率谱图,并结合试验中出现的不同水流流态,分析了相应的脉动压力变化规律。结果表明,水流脉动压力特性与水流流态变化特性一致。

The intensity of fluctuating pressure has a negative effect on the safety of earth-rockfill overflow cofferdam when water discharges. Taking Gongguoqiao cofferdam for an example, a number of model tests are carried out under different flow. Pulse pressure characteristic and its power spectrum are obtained. Combined with the different flow pattern appeared in the test, the pulse pressure variation rule is analyzed. The results show that the characteristics of fluctuating pressure accord with the variation of flow pattern.