地震高烈度区尾矿坝抗震有限元分析

尾矿坝是矿山开采的重要设施,位于地震高烈度区的尾矿坝,其安全性极为重要。以郭家沟尾矿坝为例,对位于高烈度区的尾矿坝进行了抗震稳定性分析。通过建立三维有限元模型,对固定边界和粘弹性边界条件下的计算结果进行比较。结果表明:(1)在静力工况下,坝体沉降符合实际规律,变形值自上而下呈层状分布,库区顶部中间区域沉降量最大;(2)尾矿坝加速度响应随着坝高增高而增加,堆积坝顶部最大,呈现上大下小的特征;(3)位于高烈度区的郭家沟尾矿坝坝坡满足抗震稳定要求。研究成果为高烈度区尾矿坝抗震措施提供参考。

Seismic finite element analysis on tailings dam in high seismic intensity area

As an important facility for mine exploitation,the safety of tailings dam is very important in high seismic intensity area. By taking Guojiagou Tailings Dam as the study case,the seismic stability analysis of tailings dam located in high intensity area is carried out herein. Through the establishment of a 3-D finite element model,the calculation results obtained under the conditions of both the fixed boundary and viscous spring boundary are compared. The result shows that: （1）the settlement of the dam body accords with the actual law and the deformation value is stratifiedly distributed from the upper to the lower with the maximum settlement occurred within the middle area of the top of the tailings reservoir; （2）the acceleration response of the dam increases along with the increase of the height of the dam and the maximum value occurs at the crest of the tailings stacked dam with a feature of large at the upper and small at the lower; （3）the dam slope of Guojiagou Tailings Dam located in a high seismic intensity area can meet the relevant requirement of seismic stability. The study result can provide a reference for the seismic measures of the tailings dam within high seismic intensity area.