苗尾水电站砾质土心墙堆石坝抗震复核分析

Seismic review of gravel core rock fill dam of Miaowei hydropower station

根据NB 35047-2015《水电工程水工建筑物抗震设计规范》和《澜沧江苗尾水电站枢纽工程竣工安全鉴定工作大纲》规定要求,应按照设定地震法确定场地相关设计反应谱,作为人工合成地震波的目标谱,对苗尾水电站砾质土心墙堆石坝进行抗震复核计算。根据地震动参数复核结果,结合坝料动力试验成果,采用非线性动力有限元法对苗尾水电站砾质土心墙堆石坝进行抗震复核分析。复核结果表明,大坝抗震安全性能良好,满足规范要求。

According to NB 35047-2015 Code for Seismic Design of Hydraulic Structures for Hydropower Project and Outline of Safety Assessment for Completion of Lancang River Miaowei Hydropower Project,by use of the scenario earthquake method to determine the design response spectrum,as the target spectrum of artificially synthesized seismic waves,the seismic safety checking calculation of the gravel core rock fill dam of Miaowei hydropower station should be carried out.Based on the results of ground motion parameter review,combining the results of damming material dynamic tests,the nonlinear dynamic finite element method is used for seismic review of gravel core rock fill dam of Miaowei hydropower station.The results show that the seismic safety of the dam is good.