酸性环境下黏土渗透特性的试验分析

文中以矿山蓄污土石坝黏土为原料,对其进行了在酸性环境下渗透特性的试验分析。试验表明,黏土在酸性环境下渗透系数会随着时间的推移而增加,在20%硫酸溶液条件下浸泡一周,黏土的渗透系数增加了约两倍,并且渗透系数的增加与酸性的强弱成正相关。试验还发现,黏土在酸性环境下会随着时间的推移而有失重的现象,说明酸性溶液对黏土有溶蚀作用,且浓度愈大作用愈强,致使黏土的孔隙增加,这也是渗透系数增加的原因。黏土渗透特性试验结果对进一步研究和精确预测矿山蓄污土石坝的剩余寿命具有重要意义。

Experimental study on permeation characteristics of clay to hydrochloric acid attack

With the clay from local earth dam for storing mine acid sewage as material,the permeation characteristics to hydrochloric acid attack were studied through experimental analysis.The experiment results show that the permeability coefficient of clay under acid environment will increase gradually.The permeability coefficient added twice after the clay dip in 20% vitriol solution,and it was positively associated with strong or weak of the acidity.The experiment results also show that the clay under acid environment exhibited weight loss behavior,which illustrates that the acid has the corrosion function to the clay.The test results have important significance to further study on the residual service life forecast of the earth dam.