基于瞬态渗流作用下的堆浸场边坡稳定性分析

Slope stability of heap leaching site based on transient seepage

堆浸场长期在喷淋液喷淋作用下,一直处于饱和非饱和的状态,其边坡稳定性与其他类型的边坡稳定性有很大的区别。采用专业渗流场分析软件Geo-Studio开展了基于瞬态渗流场作用下的稳定性分析,并推荐了堆浸场最大堆置高度。研究结果表明:1)在长期喷淋液作用下,降雨对边坡稳定性仅产生一定程度上的影响,安全系数降低较小。2)随着堆浸场堆高增加,边坡安全系数逐渐下降,增加到120 m时,可满足许用安全系数。3)随着喷淋液不断的喷淋,逐渐在堆浸场内部形成渗流场,主要是从堆浸场顶部向下部渗流,形成的水位线不断下降。喷淋第35 d左右,喷淋液渗流到堆浸场的底部。随着堆高增加,边坡部分散体物料受喷淋液影响逐渐减小。

The heap leaching site has been in a saturated and unsaturated state under the action of spraying liquid for a long time.Its slope stability is very different from other types of slope stability.The professional seepage field analysis software Geo-Studio was used to carry out the stability analysis based on the transient seepage field,and the maximum stacking height of the heap leaching site was recommended.The results show that:1)under the action of long-term spraying liquid,the rainfall has only a certain impact on the slope stability,and the safety factor decreases slightly.2)With the increase of the heap height of the heap leaching site,the safety factor of the slope gradually decreases.When it increases to 120 m,the allowable safety factor can be met.3)With the continuous spraying of the spray liquid,a seepage field is gradually formed inside the heap leaching site,mainly from the top to the bottom of the heap leaching site,and the water level line formed is constantly falling.Around the 35th day of spraying,the spraying liquid percolates to the bottom of the heap leaching site.With the increase of stacking height,the influence of spraying liquid on some bulk materials of slope decreases gradually.