云南某铜尾矿库不同堆坝速率稳定性分析

根据云南某铜尾矿库地勘和设计施工资料,按照尾矿库比例和现场堆坝形式,进行了大型堆坝模型试验,通过对三级子坝采样并进行颗粒级配分析,获取了模型尾矿库内颗粒级配分布。根据得到的颗粒分布确定组成尾矿库的2类尾矿样,对其采用常规土工试验获得常规土力学参数。在专用岩土数值模拟软件Geo-slope中建模并代入2种尾矿土物理力学参数,进行正常工况下的稳定性计算,得到3种堆积坝高下不同筑坝速度的安全系数(其中,4级子坝在堆坝速度5 m/a情况下,安全系数为2.173,为最大值;10级子坝在堆坝速度15 m/a情况下,安全系数为1.252,为最小值)。结果表明:在相同堆积速率下尾矿库越高安全系数越低;随着筑坝速率提高,相同坝高尾矿库坝体稳定性下降。在尾矿库设计建设时,有必要考虑尾矿库堆坝速率进行稳定性分析。

Stability Analysis on a Copper Tailing Dam under Different Damming Rate in Yunnan

According to the geological exploration and design materials of Yunnan copper tailings,large dam model are tested on the basis of the proportion of the tailings dam and the on-site damming form. Through analysis on the grain size distri-bution of samplings from tertiary sub-dam tailings, the regularity of grain size distribution in the tailing dam model are ob-tained. According to the regularity,two types of tailing sample are classified and tested by the conventional geotechnical tests to achieve the conventional soil mechanics parameters. With the use of the geotechnical numerical simulation software Geo-slope, two kinds of tailings soil physical and mechanical parameters are substituted into the model to calculate the stability under the normal working conditions. The safety coefficient under three damming heights and different damming speed kinds of stacking dam against different speed of dam are calculated out ( Among them, the maximum safety factor for the level 4 sub-dam is 2. 173 when the damming speed is 5 m/a;the minimum safety factor for level 10 sub-dam is 1. 252 when the deposition rate is 15 m/a) . The results show that under the same deposition rate,the higher the tailings,the lower the safety factor;As the dam-ming rate increase,the stability of tailing dam with the same height declines. It is necessary to make stability analysis by con-sidering the damming rate of the tailings dam.