反拱透水底板拱端推力与板块位移研究

高坝消力塘作为下游河床的防护结构，其自身在高速水流冲击下的稳定性与安全性是实现消能和防冲目的的关键所在，是水利工程所面临的亟待解决的课题之一。文章基于模型试验并结合数值模拟研究了反拱透水底板的拱端推力与板块位移特性。结果表明，与不透水底板相比，透水底板可以显著的减小拱端推力，并且拱端推力与板块位移均随开孔率的增加而减小，且减小趋势逐渐变缓，从而可以提高反拱底板的稳定性。结合拱端推力的频谱分析可知，开孔后拱端推力的脉动能量降低，并且功率谱重心向低频移动。文章成果为水垫塘防护结构“主动防护”模式在工程中的应用提供参考。

Study on the thrust at springer and plate displacement of the pervious slabs in inverted-arch plunge pool

The safety of protecting structure in plunge pool is the key to success or failure of energy dissipation. So the stability of lining structure in the plunge pool is one problem that needs to be solved in practice. Depending on the model test and numerical simulation, the hydrodynamic characteristics of the pervious slab in inverted-arch plunge pool were studied in this paper. Compared to impervious slab, the thrust at springer acting on the pervious slab reduces obviously. And the thrust at the springer and plate displacement decrease with the increasing of opening rate, at the same time the trend of reduce guadually slows down. Therefore, stability of the inverted-arch slab is improved. Integrating with the frequency spectrum analysis of the thrust at springer, energy fluctuation of the thrust at springer reduces after holing on the slab. And barycenter of power spectrum transfer to lower frequency. The achievement of this paper is significant to the application of protecting structure of plunge pool in initiative protecting mode to project.