Abstract: Slope instability is an important cause leads to failure for embankment dams. By theoretical analysis on the instability risks of embankment dam slope, the paper proposed the definition and evaluation model for risk assessment as well as five grades to classify instability risk. Further, combined with a case study, the application of this method was presented, for reference.

Key words: dam slope instability, risk, safety evaluation

摘要： 土石坝坝坡失稳是导致溃坝的重要原因之一。根据土石坝坝坡失稳风险的理论分析，提出坝坡失稳危险度的定义和评价模型，结合五级制原则对危险性等级进行了划分，为坝坡稳定安全评价提供了依据。并以某水库大坝的坝坡失稳危险度分析为例说明了该方法的具体应用。

关键词: 坝坡失稳, 危险度, 安全评价