加高扩容尾矿库地震动力稳定性分析

Seismic Dynamic Stability Analysis of Enlarged Tailings Reservoir

摘要: 尾矿库在地震作用下，可能会出现坝体浸润线抬升、尾砂液化、坝体发生位移和变形，最后造成坝体失稳甚至酿成溃坝事故。要保证尾矿库在地震动力作用下安全稳定运行，就需要对尾矿库坝体进行地震动力稳定性分析。本文通过建立尾矿库数值模型，运用有限元法选取有代表性的剖面对尾矿库进行地震动力仿真模拟计算，根据计算结果，判断安全稳定性参数指标是否在可控范围内。得出结论：当尾矿库达到加高扩容终期标高时，尾矿库主坝在经历地震的过程中，坝体在地震动力作用下仍能满足相应等别安全滩长与安全超高的要求，均无明显成片液化区的产生，坝体永久变形的位置和位移值均处于安全范围，尾矿库抗震稳定安全系数满足工程对坝体抗滑稳定的要求。

Abstract: Under the seismic action of tailings reservoir, elevation of the seepage line of the dam body, liquefaction of the tailings, displacement and deformation of the dam may occur, and finally, the dam will become unstable or even break. In order to ensure the safe and stable operation of the tailings dam under the action of seismic dynamic, it is necessary to carry out the seismic dynamic stability analysis of the tailings dam. In this paper, based on the establishment of the numerical model of the tailing pond, the representative sections selected by the finite element method are used to carry out the simulation calculation of the seismic dynamics of the tailing pond, according to the results of the calculations, to judge whether the safety and stability parameter index is in the controllable range. It is concluded that the main dam of the tailing reservoir can still meet the requirements of equivalent safety beach length and super-high safety under the action of seismic in the process of experiencing seismic when the end of the heightening and expansion period of the tailings reservoir is reached, there is no obvious piece of liquefied area, the location and displacement of permanent deformation of the dam body are in the safe range, and the seismic stability factor of safety of the tailings reservoir can meet the requirements of the engineering for the anti-slide stability of the dam body.