摘要
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。透水底板作为新型消能防冲防护结构,可以主动降低作用在防护结构上的荷载。为解读透水底板减压降载机理,文章以某拱坝消力塘水工模型试验为背景,对比分析了透水防护结构与不透水防护结构水流脉动压力及其空间尺度、消力塘底板尺寸之间的关系。研究表明,底板开孔相当于缩小了板块的有效尺度。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作积极探索。
The safety of protecting structure in a plunge pool is crucial to the success of energy dissipation,and the stability of lining structure is one of the design problems that need be solved.Pervious bottom slab is an initiative structure that decreases the load acting on the bottom of plunge pool.In this work,the relationships among pressure fluctuations,their spatial scale and the sizes of pervious and impervious slabs are studied by using model test data of a large-scale plunge pool to shed some light on the decompression mechanism of pervious structure.Results show that the role of pervious holes is equivalent to a reduction in effective slab size.This work is significant to the application and improvement of initiative protecting structures for plunge pool design.
出处
《水力发电学报》
EI
CSCD
北大核心
2010年第6期85-89,94,共6页
Journal of Hydroelectric Engineering
基金
国家自然科学基金(50539060
50779044)
国家杰出青年基金资助项目(50725929)
关键词
水利水电工程
透水底板
脉动压力
空间尺度
hydraulic and hydropower engineering
pervious slab
pressure fluctuations
spatial scales
