EKG用于排水加固细粒尾矿的试验研究  

Experimental study on EKG for drainage and reinforcement of fine tailings

作　　者：易富 余忠银 杜常博 YI Fu;YU Zhong-yin;DU Chang-bo(College of Architecture and Transportation,Liaoning Technical University,Fuxin 123000,China;College of Civil Engineering,Liaoning Technical University,Fuxin 123000,China)

机构地区：[1]辽宁工程技术大学建筑与交通学院,辽宁阜新123000 [2]辽宁工程技术大学土木工程学院,辽宁阜新123000

出　　处：《实验力学》2020年第4期712-718,共7页Journal of Experimental Mechanics

基　　金：国家自然科学基金资助项目(51774163);辽宁省教育厅科研基金项目(LJYL054);鞍钢科研项目(2018-科A19)。

摘　　要：针对尾矿干式堆存后期尾矿坝受到外来水及内部孔隙水侵害的问题,采用电动土工合成材料(EKG)对非饱和细粒尾矿砂进行室内脱水试验,研究EKG对非饱和尾矿砂含水率、沉降量和抗剪强度的影响以及电化学作用。研究表明:随着阴极电渗水不断排出,基质吸力增大,产生颗粒表面黏聚力,导致有效应力增加,从而土体强度增大;电流呈现出先短暂增加,随后按照负指数的规律衰减;电势在土体电阻增大的作用下发生降低,且在阳极附近电势降特征显著;末期电渗作用受界面电阻抑制,排水速率缓慢。EKG室内脱水试验后的尾矿砂含水率降低,抗剪强度提高,表现出较好的加固效果。Experimental study on the indoor electricity dewatering of non-saturated fine tailings with electro-kinetic geosynthetics (EKG) is performed aiming to understand the problem that tailings dam is affected by external water and internal pore water in the late dry storage of tailings. Dehydration treatment is conducted to study the effect of EKG on the moisture content, sedimentation amount and shear strength of unsaturated mine tailings and the electrochemical effects. The results show that as the cathodic electro-osmosis water is continuously drained, matric suction increases and particle surface cohesion appears, resulting in the increase of effective stress and soil strength. The current appears to increase briefly, and then decays as a function of negative exponents. The potential shows a significant drop near the anode with increasing the soil resistivity. End-electro-osmosis effect is inhibited by the interface resistance and the drainage rate becomes slow. After the EKG indoor dehydration test, the moisture content of the tailings sand decreases, and the shear strength increases, showing a better reinforcement effect.

关 键 词：电土工合成材料 细粒尾矿 脱水试验 含水率 抗剪强度 

分 类 号：X43[环境科学与工程—灾害防治]