磷石膏尾矿坝渗流场与稳定性分析

Analysis of Seepage Field and Stability of Phosphogypsum Tailings Dam

针对大峪口磷石膏尾矿坝的实际情况,设定多种运行工况。运用饱和-非饱和渗流理论,分析磷石膏尾矿坝在各种工况下的渗流场。渗流场分析结果表明,干滩长度变化以及排渗垫层的淤堵程度对浸润线的影响十分明显,干滩长度越长,坝体浸润线越低;排渗垫层淤堵越重,浸润线越高。在渗流场分析的基础上,运用饱和-非饱和边坡稳定性分析方法,对坝体进行稳定性分析,得出不同工况下坝坡的安全系数。坝坡稳定性分析结果表明,在当前实际运行坝高180m时,最小安全系数为2.27,坝体是稳定的。不同工况下的安全系数均满足技术规程的规定。

Aiming at the project ofDayukou phosphogypsum tailings dam, different conditions for the tailings dam arc designed. Based on the seepage theory, the seepage fields under different conditions are obtained. It is shown that the dry beach length and drainage clogging condition axe key influential factors; the saturation line gradually drops when dry beach is longer and it gradually elevates when the degree of drainage clogging increases. Using stability analysis method for unsaturated soil slope, the stability of the tailings dam is analyzed and safety factors under different conditions are obtained. The stability analysis results show that when the railings dam＇s height is 180m, it is stable and the minimum safety factor is 2.27. The safety factors under different conditions are greater than the minimum safety factor of third-grade dam in safetytechnicat regulations.