关键词: 挠曲核部破碎带, 重力坝, 抗滑稳定, 渗透稳定, 变形

Abstract: Many unfavorable geological structures existed in the foundation of a high gravity dam, such as compression zones, weak interlayers, and fracture zones in the flexural core. Targeted treatment methods such as replacing concrete, strengthening grouting, adding cut-off walls, and optimizing the seepage prevention system of the dam foundation were adopted during construction. By analysis of deformation and seepage monitoring data during operation, it was found that the foundation deformation was stable, and there was no obvious uneven deformation or deep sliding. The uplift water level in the dam foundation was locally high, but the anti-sliding stability and foundation safety could still meet the requirements. Furthermore, the seepage stability of the foundation rock mass could meet the requirements, the dam seepage flow decreased year by year, and the effluent was clear. The operation behavior of the dam foundation was normal, which could provide reference for dam foundation treatment and seepage prevention design under similar complex geological conditions.

Key words: fracture zones in the flexural core, gravity dam, anti-sliding stability, seepage stability, deformation