摘要
为解决大石涧水库溢流坝设计挑坎水舌空中扩散程度低、水流落点过于集中、两岸淘刷严重、影响岸坡稳定的问题,对其进行了水工模型试验研究,提出了4种修改方案,包括3种差动挑坎以及在差动坎基础上进一步优化的新型舌瓣挑坎。通过分析比较各方案30 a一遇(消能防冲设计洪水)工况下水舌扩散形态、下游河道冲淤情况等,得出新型舌瓣挑坎的各参数较优,能够较好地解决两岸淘刷严重的问题,满足下游消能防冲要求,将其确定为推荐方案。推荐方案下校核工况及设计工况的试验结果表明:采用新型舌瓣挑坎消能对泄水建筑物安全性无影响;校核工况下对下游消能区两岸产生冲刷,可能造成局部岸坡坍塌,护坦末端左半部有淘刷,但仍比坝基础高8.5 m,不会影响坝体稳定。
In order to solve the problem in the flip bucket original scheme for Dashijian Reservoir overflow dam,such as the less spreading degree of water tongue in air,the concentrated drop point of the flow,the serious scouring on both banks and the influence to the stability of the bank slope,the hydraulic model test was carried out.In this paper,four modified schemes were proposed,including three kinds of differential flip bucket and one types of flap flip bucket were optimized on the basis of it.By analyzing and comparing the hydraulic characteristics such as morphology of water tongue diffusion and characteristics of scouring and deposition in the 30years frequency flood(energy dissipation and antiscouring design flood),it was concluded that the hydraulic parameters of flap flip bucket were better,which could solve the problem of the serious scouring on both banks and meet the requirements of downstream energy dissipation and scour prevention and was determined as the recommended scheme.The test results of the design condition and the checking condition of the recommended scheme show that the use of flap flip bucket has no effect on the safety of the drainage building.Scour on both sides of downstream energy dissipation area in the checking condition,which may cause local bank slope collapse,in addition,the left half of the terminal of the apron is brushed,but still 8.5 m higher than that of the dam foundation,which will not affect the stability of the dam body.
作者
赵建坤
张晓雷
张桂花
刘少斌
ZHAO Jiankun;ZHANG Xiaolei;ZHANG Guihua;LIU Shaobin(School of Water Conservancy,North China University of Water Resources and Electric Power,Zhengzhou 450046,China;Henan Water&Power Engineering Consulting Co.,Ltd.,Zhengzhou 450016,China;Northwest Engineering Corporation Limited,Power China,Xi’an 710065,China)
出处
《人民黄河》
CAS
北大核心
2021年第3期151-154,共4页
Yellow River
基金
2019年度河南省水利科技攻关项目(GG201912)
华北水利水电大学高层次人才科研启动项目(201909006)。
