酸性溶液对重塑黄土工程性质的影响研究

Effect of Acid Solution on Engineering Properties of Remodeled Loess

地基酸碱污染已成为环境岩土工程领域一个亟待解决的问题。采用室内模拟方法,用不同酸碱度的盐酸溶液浸泡黄土,研究酸性溶液对黄土基本物理化学力学性质的影响,并通过扫描电镜试验对其进行微观研究。试验表明:随着酸性溶液酸性增强和浸泡时间的增长,黄土中交换性阳离子增多,有机质含量降低,土粒颗粒相对密度减小,黏粒含量增大,液限、塑限均增大,渗透性增强,抗剪强度降低;SEM图像显示随着酸性增强和浸泡时间增长土体孔隙孔径增大,由面-面接触逐渐转变为点-点接触。

Acid⁃base pollution has become an urgent problem to be solved in the field of environmental geotechnical engineering.The effects of acid solution on the basic physical and chemical properties of loess were studied by using indoor simulation and immersing loess with hy⁃drochloric acid solutions of different pH values.The microscopic study was also conducted by scanning electron microscopy.The results show that with the increase of acidity and immersion time in acid solution,the amount of cations in loess is increased and the content of organic matter is decreased,the proportion of soil particles is decreased and the content of clay particles is increased.The results show that the pore size increases with the increase of acidity and immersion time and the surface⁃to⁃surface contact gradually changes to point⁃to⁃point contact.