Abstract: Slope deformation and failure were existed above the opening line of downstream banks of Ertan Hydropower Station Dam. Engineering geological conditions of destruction areas and impacts of flood discharge atomization are analyzed. It is found that slope deformation and failure is mainly controlled by the shallow relaxation zone of valley slope and the atomization of rainfall and flood discharge. The shallow rock zone of the valley slope is the decisive factor, and the atomized water creates favorable boundary conditions for the deformation and failure of the slope.

Key words: high slope, deformation and failure mechanism, flood discharge atomization

摘要： 二滩水电站大坝下游两岸工程边坡开口线以上多处天然边坡发生变形破坏。通过对变形破坏区的地质条件和泄洪雾化影响进行分析，发现谷坡浅层松弛岩带是边坡变形破坏的内因，降雨及泄洪雾化积水是边坡变形破坏的外因。

关键词: 高边坡, 变形破坏机理, 泄洪雾化