华东地区某大坝坝基水质特征及防渗帷幕性状评价  

Evaluation of Water Quality Characteristics and Curtain Properties of a Dam Foundation in East China

作　　者：姚惠芹[1] 刘冬梅[2] YAO Huiqin;LIU Dongmei(College of Hydraulic&Environmental Engineering,China Three Gorges University,Yichang 443002,Hubei,China;College of Civil Engineering&Architectural,China Three Gorges University,Yichang 443002,Hubei,China)

机构地区：[1]三峡大学水利与环境学院,湖北宜昌443002 [2]三峡大学土木与建筑学院,湖北宜昌443002

出　　处：《水力发电》2022年第3期60-63,81,共5页Water Power

基　　金：国家青年科学基金项目(51809153)。

摘　　要：大坝运行后水环境发生剧变,库水中水质特征变化可导致坝基地下侵蚀性的加强,侵蚀大坝及坝基帷幕等结构,使坝基帷幕防渗材料逐渐流失,以致帷幕防渗效果大大降低,从而造成坝基帷幕防渗性能的衰减。因此,需要对运行多年后的大坝防渗帷幕性状评价进行评价。以华东地区某水电站重力坝为例,对坝前、坝体、坝基等点位进行水样采集分析,研究不同点位水样的pH值、水化学成分及胶状析出物等水质特征,详细论证大坝坝基帷幕防渗性状,判定帷幕总体防渗性状完好,局部存在薄弱部位。The water environment changes dramatically after the operation of dam,and the change of water quality characteristics in the reservoir can lead to the enhancement of underground erosion on dam foundation and dam foundation curtain structure.As a result,the dam foundation curtain seepage prevention material is gradually lost and the curtain seepage prevention effect is greatly reduced,resulting in the attenuation of dam foundation curtain seepage prevention performance.Therefore,it is necessary to evaluate the character of dam anti-seepage curtain after many years of operation.Taking a dam in East China as an example,the water samples at points such as the front of dam,the dam body and the dam foundation are collected and analyzed,and the water quality characteristics such as pH value,water chemical composition and colloidal precipitates of water samples are studied to demonstrate the anti-seepage properties of dam foundation curtain.The results show that the overall anti-seepage properties of dam foundation curtain are intact,but there are local weak parts.

关 键 词：大坝 帷幕灌浆 渗流 水质特征 性状评价 华东地区 

分 类 号：TV697.25[水利工程—水利水电工程]