Abstract: There was a horizontal crack on impervious face slab whose length was 12.5 m and serious seepage was caused. Can’t empty the reservoir that the crack must be treated underwater. The crack extended cross face slab and expansion crack, thus different treatment measures were took for different position which was mainly introduced in this paper. It was of the advantage that good effect, water resource saving, shorter construction period and lower investment. Even after Wenchuan earthquake, the repair was all right.

摘要： 继光水库大坝的防渗面板上存在一条水平向裂缝,裂缝长12.5 m,有严重渗漏现象?由于无法弃水,该裂缝必须在水下处理?裂缝横跨面板及伸缩缝,在处理方法上根据位置的不同采用了刚柔结合的防渗措施,体现了现代水下施工技术的特点?因本工程在水下施工,不改变水库运行条件,不仅可以节约水资源?缩短工期?降低工程造价,而且保证了库区和灌区人民正常的生产生活,其工程效益和社会效益都十分显著?经过四川汶川大地震的考验之后,修补部位完好?本文着重介绍了该水下裂缝修补处理技术,为其他类似水下裂缝处理提供借鉴?