Abstract: The height of Sanbanxi face-slab rock-fill dam is 185.5 m．With low storage water level, the seepage was less than 30 L/s．As water level rising rapidly in the flood season of 2007, the seepage increased, whose maximum was 303.10 L/ s.By underwater inspection, damage was found at the horizontal joints of the face－slab.Later, rehabilitation was carried out and good effect was gotten.This paper, combined with seepage monitoring data, analysed the seepage of the dam before and after the rehabilitation.

摘要： 三板溪面板堆石坝最大坝高185.5 m，蓄水初期水库在低水位运行，总渗漏量基本在30 L/ s 以下，2007 年汛期库水位迅速抬高，总渗漏量突然增大，最大达303.10 L/s。后经水下检查，发现在面板一、二期水平缝部位出现多处破损并进行了修复，面板修复取得了一定的效果。本文结合渗流监测资料重点对面板破损前后大坝渗流性态进行了分析。