摘要
为了分析某上游式尾矿坝的抗震安全性,采用等价黏弹性理论、Seed液化理论和Newmark滑动变形理论,对尾矿坝的地震动位移、加速度、液化区域、坝坡抗震稳定性及地震永久变形进行计算分析。结果表明:尾矿坝在Ⅶ度设防地震作用下,坝体动位移和加速度分布规律合理,其中水平向和竖向动位移极值分别为6.39和0.72 cm,水平向和竖向动加速度极值分别为4.06和2.64 m/s^(2);地震液化区域出现在尾水覆盖的滩面浅表层,未影响到整个坝体;地震时坝坡抗滑稳定安全系数最小值为1.09,地震结束后累计永久变形为11.95 cm。除远离坝坡的浅表层坝体出现小范围液化区外,大坝整体抗震安全性能较好,不会出现重大安全问题。
In order to analyze the seismic safety of an upstream tailings dam,the equivalent viscoelastic theory,Seed liquefaction theory and Newmark sliding deformation theory are used to calculate and analyze the ground motion displacement,acceleration,liquefaction area,seismic stability of dam slope and seismic permanent deformation of the tailings dam.The calculated results show that under the action ofⅦdegree earthquake,which is the dam’s designed resistant level,the distribution rules of dynamic displacement and acceleration are reasonable.The horizontal and vertical dynamic displacement extremum was 6.39 cm and 0.72 cm,respectively,and the horizontal and vertical dynamic acceleration extremum was 4.06 m/s^(2) and 2.64 m/s^(2),respectively.The liquefaction zone occurred in the surface of the beach which was inundated by tailwater and did not affect the whole dam body.The minimum safety factor of the dam slope was 1.09 under the action of the earthquake,and the cumulative permanent deformation was 11.95 cm after the earthquake.In general,the seismic safety performance of the dam is good,except for a small liquefaction area in the shallow dam body far away from the dam slope.
作者
郑长海
岑威钧
赵昱豪
ZHENG Changhai;CEN Weijun;ZHAO Yuhao(College of Water Conservancy and Hydropower Engineering,Hohai University,Nanjing 210098,China)
出处
《水资源与水工程学报》
CSCD
北大核心
2021年第5期215-218,共4页
Journal of Water Resources and Water Engineering
关键词
尾矿坝
动力反应
地震液化
安全系数
永久变形
tailings dam
dynamic response
earthquake liquefaction
safety factor
permanent deformation
