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针对面板堆石坝提出一种地震永久变形的计算方法，该方法以滑动体位移分析法为基本出发点．首先利用有限单元法对面板堆石坝进行静、动力反应分析；然后采用数学规划法，求解地震过程每一时间步的最小抗滑稳定安全系数及相应的滑裂面位置，从而得出整个地震过程中坝体的最危险滑裂面；在最危险滑裂面引入无厚度接触面单元，重新进行有限元动力反应计算，计算出滑裂面各单元的地震永久变形．结果表明本方法具有合理性和实用性．
Aiming at the rockfill dam, a method of calculating the permanent deformation of the earthquakes is proposed. The method takes the sliding body displacement analysis as the basic starting point. Firstly, the finite element method is used to analyze the static and dynamic response of the rockfill dam. Then, the mathematical programming method is used to solve the minimum sliding stability and safety factor and the corresponding slip surface position at each time step of the earthquake process, During the process, the most dangerous slip surface of the dam body is introduced. Non-thickness contact surface elements are introduced into the most dangerous slip surface and the finite element dynamic response calculation is performed again to calculate the permanent earthquake deformation of each unit of the slip surface. The results show that this method is reasonable and practical.