贵阳碱污染红黏土物理力学性质室内试验研究

Laboratory Tests on Physical and Mechanical Properties of Red Clay Polluted by Alkali in Guiyang

室内模拟污染条件下,对在不同浓度碱液中养护不同时间的贵阳红黏土进行物理力学指标的测定,得到了物理力学性质变化与碱浓度、养护时间之间的关系,并结合国内外的研究成果对碱污染红黏土物理力学性质变化的原因进行简要分析。试验结果表明:与未被污染红黏土相比,碱污染红黏土的质量、含水率增高,比重降低;碱液浓度相同时,随养护时间的增加呈现出孔隙比先降低后增加、液塑限先增加后降低、压缩系数先减小后增大、压缩模量先增加后减小、抗剪强度先增加后减小的变化规律。

Under the condition of laboratory simulation pollution,the physical and mechanical indexes of the Guiyang red clay were determined at different curing time in different concentration of alkali liquor,to get the relationship between physical and mechanical properties change and alkali concentration and the curing time,and combined with the domestic and foreign research results to briefly analyses the reason of physical and mechanical properties of red clay changes of alkali pollution. Experimental results show that compared with not contaminated red clay,the red clay polluted by Alkali have higher quality and moisture content,and the proportion of down;when the concentration of alkali liquor was certain,with the increase of the curing time,its void ratio and compression coefficient first decreases after increasing,the liquid plastic limit,the compression modulus and the shear strength first after reduction.