Abstract: A hydropower dam in northeast cold area suffers from structural joints damage on the overflow surface, which will seriously affect the dam safety and durability. The repair scheme of low temperature and large deformation is adopted to carry out the function repair by epoxy mortar and surface protection for structural joints on overflow surface. After treatment, the surface of structural joints is in good condition without damage during flood discharge, worth reference for treatment of similar concrete defects in cold area.

Key words: overflow surface, structural joint, epoxy mortar, surface protection

摘要： 东北寒冷地区某水电站在运行一段时间后，大坝溢流面等部位出现了结构缝破损，严重影响大坝的安全性和耐久性。采用低温高形变修补技术方案，对溢流面结构缝进行环氧砂浆功能修复及表面防护处理，经大坝泄洪考验，结构缝表面良好，未出现损伤，为北方寒冷地区相关混凝土缺陷处理提供参考。

关键词: 溢流面, 结构缝, 环氧砂浆, 表面防护