浑水入渗对尾矿坝稳定性的影响

尾矿浆体悬浮颗粒渗透导致尾矿坝体淤堵，浸润线升高，从而影响坝体稳定。针对这一现象，首先就浑水入渗对坝体的影响进行研究，然后利用自制的浑水渗流试验仪对深水入渗进行室内模拟，分析得出浑水入渗下渗透系数变化的一般规律；利用得到的一般规律将某尾矿坝的相关设计参数进行修正，通过粒径分布曲线来估算渗透性函数，其中粒径分布曲线的取得采用了激光粒度分析仪；分别将未修正和修正后的参数输入到Geo-Studio中的SEEP/W模块进行渗流场模拟，得到了不考虑和考虑淤堵后的浸润线位置和形态；最后将模拟结果代入到SLOPE/W模块中，对坝体终高时3种工况下的坝体稳定性进行了模拟，结果显示3种工况下的稳定性安全系数均有一定程度的降低。因此，坝体淤堵会降低尾矿坝的稳定性。

Influence on Stability of Tailings Dam Under Muddy Water Infiltration

The penetration of the tail slurry suspended particles leads to the phenomenon of clogging in tailing dam，and a higher seepage line impacts on stability of tailings dam.First of all，the influencing factors of muddy water infiltration are studied，then an indoor simulation experiment is made according to the former study to obtain the general law of the general regularities of variation of the coefficient of permeability of muddy water infiltration by using a self-made muddy water seepage test instrument.According to the regularities，the related design parameters of a tailings dam is corrected，and the permeability function is estimated through particle size distribution curve which is obtained by laser particle size analyzer.Then the original and the adjusted parameter are respectively input to Geo-Studio SEEP/W module in seepage field simulation，obtaining the position and form of saturation line under two kinds of situations.Finally the simulation results are plug in the SLOPE/W module，to simulate dam body stability under three kinds of working conditions at the time of the high end.The result shows that the stability safety coefficients are all in a certain degree of decrease.Therefore，it comes to a conclusion that the stability of tailings dam can be reduced by the siltation.