Abstract: Dam slope instability, liquefaction of dam filling and foundation in earthquake are key points in dam safety analysis. Review calculation for anti-sliding stability of dam through quasi-static method and liquefaction possibility analysis of dam body and overburden layer by 3D dynamic finite element method are carried out. Research results showed that the minimum anti-sliding stability coefficients of dam body are larger than 1.2, which met the requirements. And, dynamic pore pressure and the liquefaction degree of overburden layer of dam foundation are 394.08 kPa and 51.8% respectively, therefore no liquefaction problem existed for dam foundation. In 7.0 degree earthquake, the maximum compressive stress on panel is 16.56 MPa (middle of the panel), the possibility of panel cracking is small.

Key words: dynamic finite element, dam body instability, review calculation, anti-sliding stability, liquefaction of overburden layer, safety analysis

摘要： 地震作用下水库大坝的坝坡失稳、坝体填土及坝基液化是大坝安全分析的重点。通过拟静力法对大坝抗滑稳定性进行复核计算，用三维动力有限元分析坝体和覆盖层液化可能性。研究结果表明：坝体最小抗滑稳定系数均大于1.2，抗滑稳定系数符合规定要求；坝基覆盖层动孔压力和液化度极值分别为394.08 kPa和51.8%，坝基不存在液化问题。7度地震时，面板出现最大压应力为16.56 MPa（面板中部），面板开裂可能性较小。

关键词: 动力有限元, 坝体失稳, 复核计算, 抗滑稳定性, 覆盖层液化, 安全分析