某尾矿库坝体稳定性分析

针对某尾矿库的现状,在现场调查的基础上,分析了尾矿初期坝和堆积坝坝体的组成结构,开展了尾矿工程特性研究和不同情况下的坝体稳定性研究,并探讨了坝体的灾害防治措施。研究结果表明：从放矿口至库内尾矿粒径由大变小,堆积尾矿由东向西整体上有西粗东细的特征;选取瑞典圆弧法、毕肖普法等对上游法尾矿库堆积坝稳定性进行分析比较,运用数值分析方法计算各种情况下尾矿坝的安全系数均大于1.25。为了保证坝体安全系数满足规范要求,必须保证坝体排渗设施安全有效运行,及时降低坝体浸润线高度。基于安全考虑,可依靠增加坝体自重和降低库内水位来减小坝体的滑坡风险。该研究成果能为尾矿库的灾害防治提供理论依据。

Analysis on stability of a tailings dam

In the view of the current situations of a tailings dam, this article analyzes the constitute and structure of early and stacking dams, conducts research of the railings engineering properties and the dam stability under different conditions, and discusses disaster prevention and control measures. The research results indicate that the particle size gets smaller from mouth in the mine to the pond, and stacking tailings take on the characteristic of a declined thickness from the west to the east. The paper made comparison between Sweden arc method, Bishop method and upstream method in the analysis of the stability of stacking dam of railings. Numerical analysis is used to calculate the safety factors under different conditions, and the factors are all greater than 1.25. To make sure safety factors meet standard requirements, the dam drainage installations should be in safe and effective operation so that the saturation height should be lowered in time. Considering the safety, we can reduce the landslide risk by increasing the dam weight and lower the water level in the pond. The research results can provide theoretical basis for the disaster prevention of tailings pond.