CAJ | 학술논문

以土工合成粘土衬垫（Geosynthetic Clay Liner，GCL）在尾矿库防渗层中的应用为背景，研究不同浓度重金属离子（Cu 和 Zn）作用下，膨润土的自由膨胀量、液限及 GCL 渗透系数的变化规律，并分析它们之间的对应关系。试验结果显示，当重金属离子浓度在0．01 mol／L 到0．1 mol／L之间递增时，膨润土的自由膨胀量和液限会随着重金属离子浓度的增大而大幅度减小，但当重金属离子浓度从0．1 mol／L 增加到0．5 mol／L 时，膨润土的自由膨胀量和液限则只有微小变化。在渗透试验中，当渗透溶液中重金属离子浓度小于0．01 mol／L 时，GCL 的渗透系数能够保持稳定；但当重金属离子浓度大于0．02 mol／L 后，GCL 的渗透系数会随着渗透溶液中重金属离子的浓度增加而不断升高。研究结果表明，当尾矿库渗滤液中重金属离子浓度大于0．02 mol／L 时，GCL 的渗透系数与膨润土的自由膨胀量和液限之间具有良好的数学对应关系，可以利用自由膨胀量和液限对渗透系数进行预测。
이토공합성점토츤점（Geosynthetic Clay Liner，GCL）재미광고방삼층중적응용위배경，연구불동농도중금속리자（Cu 화 Zn）작용하，팽윤토적자유팽창량、액한급 GCL 삼투계수적변화규률，병분석타문지간적대응관계。시험결과현시，당중금속리자농도재0．01 mol／L 도0．1 mol／L지간체증시，팽윤토적자유팽창량화액한회수착중금속리자농도적증대이대폭도감소，단당중금속리자농도종0．1 mol／L 증가도0．5 mol／L 시，팽윤토적자유팽창량화액한칙지유미소변화。재삼투시험중，당삼투용액중중금속리자농도소우0．01 mol／L 시，GCL 적삼투계수능구보지은정；단당중금속리자농도대우0．02 mol／L 후，GCL 적삼투계수회수착삼투용액중중금속리자적농도증가이불단승고。연구결과표명，당미광고삼려액중중금속리자농도대우0．02 mol／L 시，GCL 적삼투계수여팽윤토적자유팽창량화액한지간구유량호적수학대응관계，가이이용자유팽창량화액한대삼투계수진행예측。
Geosynthetic clay liner (GCL)has been increasingly used as a hydraulic barrier for tailing impoundment.Under the action of different concentrations of heavy metal ions (heavy metal compounds are CuCl2 and ZnCl2 ),the change regulation of the free swell index, liquid limits and GCL hydraulic conductivity is researched,and the correspondences between them are analyzed.It is shown that when the concentration of heavy metal ions ranges from 0.01 mol/L to 0.1 mol/L,the free swell index and liquid limits decease with the increase of concentrations of heavy metal ions.However,further increasing of the heavy metals ions concentration (from 0.01 mol/L to 0.5 mol/L)can’t cause the two index properties decrease continually.In the permeation test,when the concentration of heavy metal ions ranges is lower than 0.01 mol/ L, the hydraulic conductivity of GCL can remain stable. By contrast, when the concentration of heavy metal ions is up to 0.02 mol/L,the hydraulic conductivity of GCL increases with the increase of heavy metals ions concentration.Results of the study show that the index properties of a bentonite has good correspondence with the hydraulic conductivity of the corresponding GCL when the heavy metal ions concentration is higher than 0.02 mol/L and they can be used to estimate the hydraulic conductivity.