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首页> 外文期刊>Canadian Geotechnical Journal >Effect of waste rock inclusions on the seismic stability of an upstream raised tailings impoundment: a numerical investigation
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Effect of waste rock inclusions on the seismic stability of an upstream raised tailings impoundment: a numerical investigation

机译：waste石包裹体对上游高架尾矿库抗震稳定性的影响：数值研究

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Over the years, seismic activity has been a relatively common cause of tailings impoundment failure. The flow of liquefied tailings from such ruptures can result in very severe consequences, including loss of life and environmental damage. A co-disposal technique consisting of placing waste rock inclusions in tailings impoundments prior to and during tailings deposition was proposed by the authors. The waste rock is placed to create continuous inclusions within the impoundment, which provide a number of environmental and geotechnical benefits, particularly with respect to seismic stability. The results of numerical simulations previously performed have shown that the UBCSAND model can predict the seismic response of tailings. The UBCSAND constitutive model was used to conduct simulations to evaluate of the use of waste rock inclusions to improve the seismic stability of a tailings impoundment. The evaluation consists of numerical analyses of an actual tailings impoundment as constructed (without inclusions), and then assuming that it was constructed with inclusions, subjected to earthquake loads of various energy contents and with different predominant frequencies. The analyses were conducted in static, seismic, and post-shaking phases. The displacement of the surface of downstream slope of the tailings dyke was recorded during the analyses. The results indicate that the presence of waste rock inclusions can significantly improve the seismic behavior of the impoundment by reducing the displacements of the surface of the downstream slope and the extent of potential failure zones. Also, the results show that in most cases, the influence of a low-frequency earthquake on the displacement of the downstream slope of the tailings dyke is more important than that of a high-frequency earthquake. The performances of the tailings impoundment with different configurations of waste rock inclusions (varying width and center-to-center spacing) were classified based on the average normalized horizontal displacement of the downstream slope (ARx) for a range input ground motions. Charts were then developed to show how ARx is influenced by the total width of inclusions, their spacing, and the input ground motions.
机译：多年来，地震活动一直是尾矿蓄水失败的相对普遍原因。破裂产生的液化尾矿可能导致非常严重的后果，包括生命损失和环境破坏。作者提出了一种共处置技术，该技术包括在尾矿沉积之前和期间将废岩夹杂物置于尾矿库中。放置废石以在水库中形成连续的夹杂物，这提供了许多环境和岩土方面的好处，特别是在地震稳定性方面。先前进行的数值模拟结果表明，UBCSAND模型可以预测尾矿的地震响应。 UBCSAND本构模型用于进行模拟，以评估废石夹杂物的使用，以改善尾矿库的抗震稳定性。评估包括对实际建造的尾矿蓄水池（不包含夹杂物）的数值分析，然后假定它是由包裹体构成的，承受了各种能量含量和不同主要频率的地震荷载。分析是在静态，地震和振动后阶段进行的。在分析过程中记录了尾矿坝下游坡面的位移。结果表明，waste石包裹体的存在可以通过减少下游斜坡表面的位移和潜在破坏区域的范围来显着改善蓄水库的地震性能。结果还表明，在大多数情况下，低频地震对尾矿坝下游坡度位移的影响比高频地震更为重要。根据下游坡度（ARx）的平均归一化水平位移在一定范围内输入地面运动的情况，对具有不同构型的废石夹杂物的尾矿蓄水库的性能（宽度和中心距变化）进行了分类。然后绘制图表以显示夹杂物的总宽度，它们的间距和输入的地面运动如何影响ARx。

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