金属矿山尾矿坝渗流场模拟及稳定性数值分析

Seepage Field Simulation and Numerical Analysis of Stability of Metal Mine Tailings Dam

在介绍金属矿山尾矿坝稳定性分析一般流程的基础上,选择灵宝市阳平镇金矿尾矿坝为工程实例,应用GEO-Studio软件中的渗流分析模块SEEP/W,模拟在初期坝透水与不透水的情况下,干滩面长度分别为30,50,100 m时尾矿坝的渗流场变化规律。应用GEO-Studio软件中的稳定性分析模块SLOPE/W,计算相应工况下尾矿坝的最危险滑动面与稳定性系数。结果表明,在初期坝不透水时坝体浸润线与尾矿坝坡面相交,地下水从坡面往外渗流;在初期坝透水的情况下,坝体浸润线均未超过初期坝,与尾矿坝坡面亦不相交,则地下水不会从坡面往外渗出。在各种工况下,稳定性系数均大于规范中的安全系数,且在初期坝透水的情况下,其稳定性系数均大于其不透水的情况。这也说明该尾矿坝稳定性较好,若初期坝的透水性好,则对整个尾矿坝的稳定是有利的。

Based on the introduction of the general process about the stability analysis of metal mine tailings dam,a gold mine tailings dam in Yangping Town,Linbao City is selected as an example.SEEP/W,the seepage analysis module of GEO-Studio,is applied to simulate the changing regularity of seepage field when the length of the dry beach is 30m,50m or 100m respectively on the condition that the initial dam is impervious or pervious.Accordingly,SLOPE/W,the stability analysis module,is used to calculate the most dangerous sliding surface and stability factor in each condition.The results show that when the initial dam is impervious,the saturation line intersects tailings dam surface,and the groundwater will flow out from the dam surface;When the initial dam is pervious,the saturation line is lower than the initial dam and does not intersect the dam surface,in result,the groundwater will not flow out from the dam surface.In each condition,the stability coefficient is larger than the safety factor in the specification and when the initial dam is pervious the safety factor is larger than the factor when the initial dam is impervious.It also indicates that the tailings dam is stable,and it will be favorable for the stability of the tailings dam if the water permeability of initial dam is good.