摘要
某水电站左右岸坝肩均有一定厚度覆盖层,如不处理则存在绕坝渗流问题。设计在此考虑了两类防渗墙措施,即防渗墙不穿透粉质黏土层和防渗墙与基岩封闭,为了优化防渗墙的长度和评估渗漏量,在此设计了4种不封闭工况和2种封闭工况,目的是优化防渗墙长度。根据计算结果分析发现,发现不同部位的渗漏量、水力梯度和水头值均随着防渗墙的延伸单调递减,不封闭时存在渗漏量偏大和局部水力梯度不满足规范要求的问题;封闭时,则渗流量不大,且各部位水力坡降满足规范要求,推荐防渗墙封闭措施。
There exists certain depth cover stratum in both sides of hydropower station dam, if it isn＇t done with seepage problem a- round the dam in the abutment of a hydropower station being taken place. So both kinds of the cut-off wall is designed, one is the cut -off isn＇t penetrated through the silty clay layer, the other being extended into the rock mass. In order to optimize the length of the wall and estimate the leakage from these problems, four kinds of no penetration scheme and two kinds of linking into rock mass are computed. Based on analysis of these caculating results, found the leakage, hydraulic gradient and total water head vibrate monoton- ously, that leakage is overextended and local hydraulic gradient doesn＇t meet the code requirement in no penetrated through schemes and that all index meet the code standards in the extended into rock mass schems. So the bedrock close scheme is recommneded.
出处
《中国农村水利水电》
北大核心
2010年第1期63-66,共4页
China Rural Water and Hydropower
关键词
坝肩
防渗墙
渗流
流量
水力坡降
abutment, cut-off wall, seepage discharge, hydraulic gradient
