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Numerical analysis of seismic stability of a high centerline tailings dam

机译：高中线尾矿坝抗震稳定性的数值分析

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摘要

Rapid growth of mining activities parallel with recent technological progresses in this field has led to continuous production of great amounts of mining waste. Tailings dams are constructed to safely store these materials in order to protect the environment and water resources against mineral and chemical contaminations. However, the high rate of failure in these structures-especially under dynamic loads- has become a major concern for the mining industry as well as environment protection authorities. Considering the importance of these dams' role and their stability in protecting the environment, this paper analyzes the dynamic behavior of a high centerline tailings dam in order to evaluate its stability. To achieve this goal, a coupled stress-pore pressure analysis is carried out by SIGMA/W software to study the clam's behavior during and at the end of staged construction. Then, the structure's dynamic response to different seismic criteria relevant to the area of interest is investigated using the QUAKE/W software to determine the history of acceleration at the dam's crest and liquefied zones in the impoundment. Permanent deformations are then determined by a stress redistribution analysis conducted by SIGMA/W software and performance of the dam is evaluated accordingly. Analyses results show that the studied dam is stable under weak ground motions, but unstable under stronger seismic inputs.
机译：采矿活动的快速增长与该领域的最新技术进步相结合，导致了持续产生大量采矿废物。尾矿坝的建造是为了安全地存储这些材料，以保护环境和水资源免受矿物和化学污染。但是，这些结构的高故障率，尤其是在动态载荷下，已成为采矿业和环境保护部门的主要关注点。考虑到这些水坝的作用及其在保护环境中的稳定性的重要性，本文分析了一个高中线尾矿坝的动力特性，以评估其稳定性。为了达到这个目标，通过SIGMA / W软件进行了应力-孔隙压力耦合分析，以研究蛤construction在分阶段施工期间和结束时的行为。然后，使用QUAKE / W软件研究结构对与感兴趣区域相关的不同地震准则的动力响应，以确定在蓄水坝中坝顶和液化区的加速度历史。然后通过SIGMA / W软件进行的应力再分布分析确定永久变形，并据此评估大坝的性能。分析结果表明，所研究的大坝在弱地震动下是稳定的，而在强地震输入下是不稳定的。

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