鞍钢齐大山尾矿坝动力响应分析

Analysis of Dynamic Response of Angang Qidashan Tailings Dam

针对尾矿坝的动力响应问题,基于完全非线性动力分析理论,利用有限差分软件FLAC^(3D),分析计算了尾矿坝地震响应,获得了尾矿坝在地震作用下的加速度放大系数、动位移、有效应力及库区液化的动力响应特性。结果表明,在静力作用下,尾矿坝整体处于稳定状态,稳定性系数为1.71。在动力荷载作用下,竖直方向和水平方向加速度放大系数分别为2.86和2.1,有效应力不大,具有较大的安全储备;坝体水平向位移变化不大,且液化范围较小,不影响尾矿坝的整体稳定性。

For studying dynamic response of tailings dam,the seismic response of tailings dam was calculated with the finite difference software FLAC-（3D）based on the fully nonlinear dynamic analysis theory,and the acceleration amplification coefficient and dynamic displacement,effective stress and the dynamic response characteristics of liquefaction in reservoir were obtained. The results showed that the overall tailings dam was in a stable state under the action of static force with the stability coefficient at 1. 71. While the action of dynamic load led to the dam with acceleration amplification coefficients for the vertical direction and horizontal directions at 2. 86 and 2. 1,respectively,as well as with low effective stress and more safe reserves. It is shown that little change in the horizontal displacement for the dam and a small percentage of liquefaction,result in little impact on the overall stability of the tailings dam.