文献类型：期刊文献

中文题名：碱污染红黏土物理性质及微观结构试验研究

英文题名：Experimental Study on Physical Properties and Microstructure of Red Clay Polluted by Alkali

作者：王麒 陈筠 赵鹏 施鹏超 沙运斌

第一作者：王麒

机构：[1]贵州大学资源与环境工程学院;[2]贵州理工学院交通工程学院

第一机构：贵州大学资源与环境工程学院,贵阳550025

年份：2017

卷号：13

期号：6

起止页码：1483-1492

中文期刊名：地下空间与工程学报

外文期刊名：Chinese Journal of Underground Space and Engineering

收录：CSTPCD;;北大核心:【北大核心2014】；CSCD:【CSCD2017_2018】；

基金：贵州省科学技术基金(黔科合J字[2015]2033号);贵州大学研究生创新基金(研理工2017045)

语种：中文

中文关键词：碱污染红黏土;物理性质;有机质;微观结构;元素

外文关键词：alkali contaminated red clay ; physical properties ; organic matter; microstructure ; elements

摘要：碱污染使得贵州某铝厂地基红黏土孔隙比、比重和塑性指数降低。结合实际污染液浓度及入磨母液为污染源,考虑时间和浓度效应,对碱污染原状红黏土通过室内土工、电镜扫描试验、能谱分析,研究其物理性质的变化。结果表明:高浓度下,各基本物理指标总体低于蒸馏水养护下各指标,有机质含量、比重、黏粒含量、塑性指数、孔隙比整体降低,养护0~10 d期间,浓度越大指标降低程度越大,10 d时出现极值点;低浓度下,土颗粒较为分散,各物理指标多在20 d或40 d时出现极值点;入磨母液中,各物理指标均较低。污染红黏土特殊物理性质的变化是其微观孔隙面积、颗粒个数、新盐填充在微观孔隙内部以及黏土矿物吸附溶液中物质所共同导致的,另外,碱污染红黏土中粘土矿物不吸附Mg元素,岩土工程中应引起注意。
The vulnerability of the foundation of a factory building in Guizhou is due to the alkali pollution,which is originated in the decrease of void ratio,specific weight,and plasticity index of the land.In order to study the transformation of fundamental physical properties of red clay,the authors designed laboratory experiments combined with the pollution of the alkali concentration and the sources of the production process of Alumina.The facts of maintenance time and concentration of alkali liquor were also considered into the experiments.Within the help of technologies such as scanning electron microscope（SEM） and energy spectrum analysis,the results were concluded and supported by the raw data.The achieved results suggest that the organic matter,specific weight,clay content,plasticity index and the void ratio all decreased within the increase of independent variables under high NaOH solution.The numbers are lower than the null samples of red clay throughout the experiment,which is maintained in the distilled water.During the first 10 days of the experiment,the reduction of fundamental physical properties increased with the concentration of lye.The extreme value of high Na OH solution appeared to be on the tenth day.Which under the circumstances of low Na OH solution,soil particles are dispersed.The extreme value of the physical properties appeared on twentieth day and the fortieth day.The physical properties are measured at a low extent under the pure alkali concentration solution.This conclusion proposes that the dependent variables of the microstructure of red clay polluted by alkali are the pore areas,gain ＇s numbers,the new salt accumulated in the pores of the microscopic pores and absorbed the material.In addition,clay minerals in alkali contaminated red clay do not absorb Magnesium elements,which should be noted in geotechnical engineering.