Abstract: The concrete cutoff wall of auxiliary dam was the main project in rehabilitation of Huangbizhuang reservoir. By examination of the wall quality and comparison of the underground water level upstream and downstream of the cutoff wall before and after rehabilitation, conclusions obtained that the quality of cutoff wall was good and it was effective in seepage prevention. As well, the cracks on blanket were eliminated and the safety stability of auxiliary dam with normal storage was guaranteed.

Key words: cutoff wall, wall quality, seepage prevention effect, blanket crack, safety stability

摘要： 副坝混凝土防渗墙工程是该库除险加固工程重要项目之一。对墙体质量检测和建墙前后及防渗墙上下游地下水位的分析表明，混凝土防渗墙质量优良，防渗效果显著，消除了铺盖裂缝等隐患，正常蓄水位情况下，副坝的安全稳定得到了保障。

关键词: 防渗墙, 墙体质量, 防渗效果, 铺盖裂缝, 安全稳定