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采用三维非线性有限元技术,在静力分析的基础上对大坝的动力特性及抗震安全性进行动力反应分析,动力计算中坝体材料及覆盖层采用考虑围压效应的Hardin-Drnevich模型,采用可以考虑围压效应的残余体应变及残余轴应变计算公式对坝体永久变形进行计算.计算结果显示:大坝在地震过程中产生了较为明显的地震动力反应;坝体顶部产生了较为明显的地震永久变形,最大震陷140.6cm,为最大坝高的0.59%;在30s的计算时长中大坝上、下游坝坡稳定安全系数小于1的累积时刻分别为2.56s和2.76s;坝顶以下45m范围内上游反滤层动强度安全系数小于1.根据计算结果提出了相应的建议,供工程设计参考.
Based on the static analysis, the dynamic response of dam’s dynamic characteristics and seismic safety are analyzed by using the three-dimensional nonlinear finite element method. The Hardin-Drnevich model considering the confining pressure effect is adopted in the dam body material and overburden in dynamic calculation. The permanent deformation of the dam body is calculated by using the formula of residual body strain and residual shaft strain which can consider the confining pressure effect.The calculation results show that the dam has obvious earthquake dynamic response during the earthquake process and the obvious crest at the top of the dam The maximum seismic collapse is 140.6cm, which is 0.59% of the maximum dam height. The cumulative time when the safety factor of stability of the upstream and downstream dam slopes is less than 1 is 2.56s and 2.76s respectively in the calculation time of 30s. The safety factor of dynamic strength of the upstream filter layer below 45m is less than 1. According to the calculation results, the corresponding suggestions are put forward for engineering design reference.