面板堆石坝地震永久变形计算方法研究

Study of calculation method of permanent deformation due to earthquake of concrete faced rock fill dam

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 concrete faced rock fill dam, this paper presents a method for calculating permanent deformation of dam due to earthquake. In the theory, considering the displacement analysis method of sliding mass as the starting point, the static and dynamic response analysis of concrete faced rock fill dam is firstly done; and then, using FEM and applying the mathematical programming method, the lowest safety coefficient of sliding stability and the corresponding location of sliding surface in each step of earthquake induced are solved. Thus, the most dangerous sliding surface during the period of the whole earthquake is given; after this, making a fresh procession of dynamic response calculation by adding non thick joint element on the most dangerous face, all the elements' permanent deformations on sliding face therefore could be turned out. Fromthe result, the method presented proves to be quite reasonable and applicable.