某抽水蓄能电站下水库主坝抗震安全性复核分析  

Seismic safety review of lower reservoir dam of a pumped storage power station

作　　者：许雷 杨鸽 刘慧 XU Lei;YANG Ge;LIU Hui(PowerChina Huadong Engineering Co.,Ltd.)

机构地区：[1]中国电建集团华东勘测设计研究院有限公司,浙江杭州311122 [2]国家能源局大坝安全监察中心,浙江杭州311122

出　　处：《大坝与安全》2022年第6期48-53,58,共7页Dam & Safety

基　　金：国家重点研发计划(2021YFC3090100)。

摘　　要：根据新版GB 18306—2015《中国地震动参数区划图》,某抽水蓄能电站下水库主坝基岩水平地震动峰值加速度由0.138g调整至0.20g,相应地震烈度由Ⅷ度升至Ⅸ度。为了评价大坝抗震安全性,选择典型断面采用动力时程法和拟静力法进行复核计算,计算结果表明,坝体震后竖向残余变形小于坝高的0.6%,坝顶处存在三个规模很小的滑动体,但不影响坝体整体安全稳定性,不同断面下游坝坡抗滑稳定安全系数均大于规范要求,Ⅸ度地震工况下防浪墙顶计算高程低于实测防浪墙顶最低高程,大坝抗震安全性满足现行规范要求。According to GB 18306—2015 Seismic Parameter Zoning Map of China,the ground motion peak acceleration of a pumped storage power station is adjusted from 0.138g to 0.2g and seismic basic intensity is adjusted from 8 to 9.To evaluate the seismic safety of the dam,the dynamic time-history method and the quasi-static method are used for the review calculation of typical sections.The calculation results show that the vertical residual deformation of the dam after the earthquake is less than 0.6%of the maximum dam height.There are three small-scale sliding bodies at the top of the dam,which exert no harmful effect on the overall safety.The slope stability of different sections are all greater than the requirements in the specification.The calculated elevation of the wave barrier crest is lower than the minimum elevation of the measured wave barrier crest under the condition of 9-degree earthquake.Therefore the seismic safety of the dam can satisfy the requirements from the current specification.

关 键 词：抗震安全性 面板堆石坝 坝坡稳定 动力时程法 拟静力法 

分 类 号：TV698.1[水利工程—水利水电工程]