水利学报2017，Vol.48Issue(11)：1261-1268,8.DOI:10.13243/j.cnki.slxb.20161343
高含沙泄洪水流的荷载特性试验研究
Experimental study of load characteristics on hyperconcentrated discharge flow
摘要
Abstract
The characteristics of hyperconcentrated flow have been deeply studied by former scholars,and most of them are about gradually varied flow in the riverway,but are barely about the load characteristics of high dam discharge flow on hyperconcentrated river.In this paper,the time-average pressure and fluctuating pressure of orifice energy dissipater were studied.The experiment contained 28 different conditions,with sediment concentration ranging from 0 to 300kg/m3,and velocity ranging from 1.78m/s to 3.73m/s.The results show that:the time-average pressure and fluctuating pressure of high dam hyperconcentrated discharge flow has the same distributing rule as the pure water,but differs in the value,the value of time-average pressure increases as the sediment concentration increases under the same velocity condition,while the fluctuating pressure is affected by both the sediment concentration and the velocity condition,which declines after the first increase;the probability density of fluctuating pressure follows the normal distribution;the frequency distribution range of fluctuating pressure increases as the velocity increases,and the low frequency component increases as the sediment concentration increases.Based on the results,this paper proposed a load calculation correction method which has an important value of project design on hyperconcentrated rivers.关键词
高含沙泄洪水流/孔板消能工/时均压力/脉动压力/荷载计算修正方法Key words
hyperconcentrated discharge flow/orifice energy dissipater/time-average pressure/fluctuating pressure/load calculation correction method分类
建筑与水利引用本文复制引用
练继建,杜昀怡,刘昉,胡剑超..高含沙泄洪水流的荷载特性试验研究[J].水利学报,2017,48(11):1261-1268,8.基金项目
国家重点研发计划(2016YFC0401904) （2016YFC0401904）
国家自然科学基金项目(51579172,51409187,51509180) （51579172,51409187,51509180）
天津市应用基础与前沿技术研究计划(青年项目)(15JCQNJC07100) （青年项目）
国家自然基金委创新团队(51621092) （51621092）
