摘要
尾矿库的浸润线对坝体的稳定安全至关重要。尾矿坝体内的化学淤堵会使介质渗透系数减小,坝内地下水位升高,增加渗流破坏发生的可能性。因此,研究化学淤堵对尾矿砂渗透系数的影响规律显得尤为重要。以栗西尾矿库为研究对象,通过现场调研和室内试验相结合的方式,分析了不同浓度的二价铁离子溶液对均质尾矿砂渗透系数的影响规律。结果显示,栗西尾矿库排水设施周边伴有化学淤堵现象发生;粒径为0.315 mm的砂粒质量占尾矿砂总质量的38.82%,比重最大;尾矿废水中二价铁离子的浓度为0.13～0.49 mg/L;二价铁离子引起的化学淤堵使尾矿砂渗透系数的变化规律符合指数函数,其中浓度为0.4～0.5 mg/L、0.2～0.3 mg/L工况下渗透系数的变化过程比较接近,二价铁离子浓度为0.3～0.4 mg/L工况下化学淤堵发生最为迅速,稳定时间最短。
The saturation line of tailing reservoirs is crucial to tailings dams stability and safty. While the chemical clogging in tailings dams will reduce the permeability coefficient of the porous medium. This will lead to the rise of groundwater level in tailings dams and increase the likehood of the seepage destruction. So it is particularly important to analyze the influence of the chemical clogging on the permeability coefficient. This paper,focused on Lixi tailings dam,have studied the influence rules of the permeabilty coefficient of the tailings sand using different concentrations of the ferrous solution. It showed that around the drainage facilities of Lixi tailings dam the phenomenon of chemical clogging always happened. The mass of the particle size of0. 315 mm accounts for 38. 82 percent of the total tailing sand which is the largest percentage. The concentration of the ferrous ions in tailing waste water is 0. 13 ～ 0. 49 mg / L. The chemical clogging caused by ferrous ions lead to the permeablity coefficient changed in the way of exponential. And the change process of the permeability coefficient is close at the ferrous concentrations of 0. 4 ～ 0. 5 mg / L and 0. 2 ～ 0. 3 mg / L.While at the concentration of 0. 3 ～ 0. 4 mg / L of the ferrous solution the chemical clogging occured more quickly and it＇s time to reach steady was shorter.
出处
《水文地质工程地质》
CAS
CSCD
北大核心
2016年第4期26-29,42,共5页
Hydrogeology & Engineering Geology
基金
国家自然科学基金项目(51409206)
陕西省自然科学基金项目(2016JM5057)
西安理工大学科学研究计划项目(2015CX015)
陕西省重点科技创新团队(2013KCT-15)
陕西省科技统筹创新工程计划(2013KTZB03-01-01)
关键词
化学淤堵
尾矿坝
渗透系数
chemical clogging
tailings dam
permeablity coefficient
