中南大学学报（自然科学版）2018，Vol.49Issue(4)：910-915,6.DOI:10.11817/j.issn.1672-7207.2018.04.019
膨润土-红黏土混合土对NaCl溶液的渗透试验研究
Experimental study of permeability of bentonite-laterite mixtures for salt solutions
摘要
Abstract
The bentonite-laterite mixtures with different mass ratios of bentonite were compacted, and then permeability of the mixtures was tested for NaCl solutions with different concentrations. Based on theory of the diffuse double layer and micro-structure characteristics of soil particles, effect mechanism of salt solutions on permeability coefficient of the mixtures was analyzed. Furthermore, an empirical equation between saturated permeability and bentonite content (mass fraction) was established according to the tested results. The results show that saturated permeability of bentonite-laterite decreases with the increase of bentonite content, and thus retarding ability improves significantly. The infiltration of NaCl solution induces more flocculation, which decreases the permeability of laterite soil. For mixtures with 20% (mass fraction) bentonite, the permeability coefficient increases with the increase of salt concentration due to the compression of diffuse double layers.关键词
压实黏土衬垫/红黏土/膨润土/盐溶液/渗透系数Key words
compacted clay liner/laterite/bentonite/salt solution/hydraulic conductivity分类
天文与地球科学引用本文复制引用
陈永贵,雷宏楠,贺勇,叶为民..膨润土-红黏土混合土对NaCl溶液的渗透试验研究[J].中南大学学报（自然科学版）,2018,49(4):910-915,6.基金项目
国家自然科学基金资助项目(41772279)(Project(41772279) supported by the National Natural Science Foundation of China) （41772279）
