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

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