摘要： 三板溪水电站主坝为国内第二高堆石坝，其面板在蓄水过程中沿一二期水平施工缝发生局部受损，为同类坝型罕见，成因还有待分析确定。设计采用了PBM 混凝土修复方案，施工全部潜水40 m 以上，要求高，难度大。

Abstract: During water impounding, part of horizontal construction joint on the face slab of Sanbanxi high rockfilled dam was damaged. This was rare and cause reason was not clear yet. PBM concrete was adopted in rehabilitation design. The rehabilitation construction was difficult and of high requirements.