宽尾墩消力池透水底板脉动压力试验研究

Experimental study of the fluctuating pressure on pervious slab in stilling basin under jet flow from tail-flaring piers

与不透水底板相比,透水底板能够降低作用在其上的动水荷载,达到防护结构安全稳定的目的。为了更好地认识透水底板这种新型防护结构形式,基于阿海水电站宽尾墩底流消力池水工模型试验,系统地研究了消力池平底透水底板表、底面脉动压力特性在板块开孔前后的变化规律。试验结果包括脉动压力沿程分布规律、概率密度分布的正态性、板块表、底面时空相关性、积分尺度以及脉动压力功率谱密度,并初步探讨了透水底板减压降载机理。试验成果可为消力池透水底板设计提供参考。

Compared to the unpervious slab,the pervious slab can improve the stability of protective structures through the reduction of hydrodynamic stresses.In order to better understand this new type of protective structures,an experimental study of the fluctuating pressure on pervious slab is carried out in a stilling basin under jet flow from tail-flaring piers.The fluctuating pressure is imposed on both sides of the pervious slab.Measurements are made on the variation of fluctuating pressure along the longitudinal direction,the density distribution of fluctuating pressure,the time-space relationship between the top and the bottom of the pervious slab,the integral scale,and the power spectral density.The experimental results and the subsequent discussion on the decompression mechanism of pervious slabs provide valuable references for the design of pervious slabs.