摘要
水流冲渣是水电站导流洞围堰拆除时的关键技术之一。针对水流冲渣的几个相关问题,分析了导流洞进口围堰拆除时的水流流速变化、爆破后爆渣的块度特征以及爆渣启动流速与块度之间的关系,并结合云南金沙江中流阿海水电站1#导流洞进口围堰的爆破拆除实例,研究了围堰爆破拆除水流冲渣技术。结果表明,可根据围堰拆除时的水流流速分析及爆渣的启动速度,通过控制围堰爆破拆除设计参数,使得爆渣特征块度的启动流速小于导流洞内的水流流速,从而利用水力作用实现水流冲渣,研究结果可促进水电工程经济、快速施工。
Water flow impact residue is one of the key technologies of demolishing diversion tunnel intake cofferdam in hydropower station.Aim at several problems related to water flow impact residue,the changes of flow velocity after the demolition of diversion tunnel intake cofferdam,the fragmentation characteristics of blasting residue and the relationship between the start velocity and fragmentation of blasting residue had been analyzed.Moreover,combined with the example of explosive demolition of the 1^# diversion tunnel intake cofferdam in Ahai Hydropower Station in Jinsha River of Yunnan province,the water flow impact residue technology of diversion tunnel intake cofferdam by explosive demolition has been studied.The results indicated that based on the analysis of flow velocity after the demolition of the cofferdam and the analysis of the start velocity of the blasting residue,controlling the blasting residue fragmentation through the design parameters of explosive demolition of cofferdam,so as to the start velocity of blasting residue less than the flow velocity inside diversion tunnel,consequently,the water flow impact residue by water power can be achieved.The research result can promote the hydropower projects much more economical and faster.
出处
《爆破》
CSCD
北大核心
2010年第3期73-76,80,共5页
Blasting
基金
"十一五"国家科技支撑计划资助项目(2008BAB29B01)
国家自然科学基金资助项目(50725931)
关键词
爆破拆除
水流冲渣
爆破块度
导流洞
围堰
explosive demolition
water flow impact residue
blasting fragmentation
diversion tunnel
cofferdam
