地震作用下某上游式尾矿坝动力响应分析

尾矿坝特殊的筑坝方式和筑坝材料，使得坝体在地震作用下容易失稳破坏，对下游居民的生命和财产造成威胁。针对尾矿坝动力响应问题，基于有限元分析方法，运用等效线性原理进行尾矿坝动力响应分析。分析计算了在地震荷载作用下某上游式尾矿坝的动位移、响应加速度、动应力以及库区液化的分布情况。计算结果表明：在静力作用下，尾矿坝处于稳定状态。顺河向加速度放大系数最大值出现在3h/4坝高节点处；堆积坝最大主应力和最小主应力均为压应力；坝体顺河向、垂直向最大动位移较小。通过Matlab语言编写后处理程序，生成不同地震时程下的坝体液化区域，结果显示液化区主要集中在浸润线以下的沉积滩浅层区域，未贯穿整个坝体。

Dynamic response analysis of an upstream tailing dam under earthquake

Due to the special damming methods and materials of the tailings dam, the dam body is easy lose stability and is damaged under the action of the earthquake, which poses a threat to the life and property of downstream residents. Aiming at the dynamic response of tailings dam, based on the finite element analysis method, the dynamic response of tailings dam is analyzed by using the equivalent linear principle. The dynamic displacement, response acceleration, dynamic stress, and liquefaction distribution of an upstream tailings dam under seismic load are analyzed and calculated. The calculation results show that the tailings dam is in a stable state under the static action. The maximum acceleration amplification factor along the river appears at the node of 3h/4 dam height. The maximum principal stress and minimum principal stress of the accumulation dam are compressive stress. The maximum dynamic displacement of the dam body along the river and vertically is small. The post-processing program is written in MATLAB language to generate the dam liquefaction area under different seismic time histories. The results show that the liquefaction area is mainly concentrated in the shallow area of the sedimentary beach below the phreatic line and does not penetrate the whole dam.