关键词: 浆砌石拱坝, 坝肩稳定, 帷幕灌浆, 结构修复, 抗滑稳定, 除险加固

Abstract: Baishuihe reservoir is a small single-curvature masonry arch dam (Small-size(1)) built in 1994, and is designed primarily for power generation with flood control as a secondary function. After 30 years of operation, the abutment exhibits defects such as by-pass seepage, localized retaining wall col ⁃ lapses, and insufficient elevation of the protective concrete facing. Therefore, the dam has been classi ⁃ fied as Class Ⅲ. In this paper, the causes of these defects are studied and a comprehensive reinforce ⁃ ment plan is proposed which includes cement curtain grouting for seepage control of the right abutment and reinforcement of the retaining wall at the left dam abutment. Verification results using the rigid- body limit equilibrium method show that, after reinforcement, the safety factor for slip stability of right abutment has improved and the safety margin has increased, while the left abutment maintains a high level of stability; seepage pathways have been sealed, the integrity of local structure has been restored, and major safety hazards have been effectively eliminated. This plan is technically reliable and economi ⁃ cally sound, and can serve as a reference for addressing similar defects in the abutments of aging mason ⁃ ry arch dams.

Key words: masonry , arch , dam,  , abutment , stability,  , curtain , grouting,  , structural , reinforcement,  , anti-slip , stability, rehabilitation