水库大坝防渗帷幕渗流模拟试验研究  

Simulation test research on seepage of anti-seepage curtain of dams and reservoirs

作　　者：饶承彪 张细和 RAO Chengbiao;ZHANG Xihe(Powerchina Guiyang Engineering Corporation Limited,GuiYang 550081,China)

机构地区：[1]中国电建集团贵阳勘测设计研究院有限公司,贵州贵阳550081

出　　处：《水利水电快报》2023年第4期89-96,108,共9页Express Water Resources & Hydropower Information

摘　　要：为了研究水库大坝坝基和廊道析出物的来源以及水库蓄水后相应水化学环境下坝基渗流场帷幕水泥结石中钙质的溶出与腐蚀特征、流失规律,分析不同介质灌浆后形成的水泥结石组分与结构特征,模拟了防渗帷幕体在不同工况下的渗流试验、强度试验和微观试验。结果表明:坝基等析出物来源于帷幕体而非基岩;不同模拟介质灌浆后形成的水泥结石成分大体相同;对灌浆效果较好的帷幕体系,在水库蓄水后相应水化学环境下,坝基渗流场中帷幕水泥结石在充填裂隙中会有一个持续自闭合的过程,使防渗帷幕的防渗效果逐渐得以强化。In order to study the source of precipitation in the dam foundation and the verandage of the reservoir,the dissolution and corrosion characteristics and loss rules of calcium in curtain cement stone in seepage field of dam foundation under the corresponding hydrochemical environment after reservoir impoundment,and analyzed the composition and structural characteristics of cement stone formed by grouting with different media,the simulated seepage test,strength test and microscopic test of the curtain body under different working conditions were performed.The results showed that the precipitates of dam foundation were derived from curtain body rather than bedrock.The composition of cement stones formed after grouting with different simulated media was roughly the same.For the curtain system with better grouting effect,the curtain cement stone in the seepage field of dam foundation had a continuous self-healing process in the filled fissure under the corresponding hydrochemical environment after the reservoir impoundment,and the anti-seepage effect of the anti-seepage curtain was gradually strengthened.

关 键 词：水库大坝 防渗帷幕 灰岩 英安岩 渗流模拟 析出物分析 

分 类 号：TV322[水利工程—水工结构工程]