东南大学学报（英文版）2021，Vol.37Issue(3)：299-305,7.DOI:10.3969/j.issn.1003-7985.2021.03.010
基于层间阳离子水化的黑棉土黏土矿物膨胀研究
Clay mineral expansion of black cotton soil based on interlayer cation hydration
摘要
Abstract
To analyze the water swelling characteristics of black cotton soil (BCS),X-ray fluorescence and X-ray diffraction characterizations were performed to investigate the chemical compositions and types of clay minerals in BCS.A montmorillonite crystal lattice was established to simulate the hydration of interlayer cations by applying the SPC/E potential energy model,universal force field,algorithm of charge balance,and periodic boundary.Results indicated that the main clay mineral found in the BCS was montmorillonite(32.6％) with small amounts of interstratified illite-montmorillonite (10.9％),illite (2.3％),and kaolinite(1.5％).The high expansive potential of BCS comes from the strong adsorption property of montmorillonite with a high content of magnesium and sodium ions to water molecules.The exchangeable cations of Na+ in BCS were only 3.73％,but they enhanced the adsorption capacity of clay to water molecules and accelerated the hydration of Mg2+ (47.1％) and Ca2+ (4.78％).The free swell index can be used as a classification index of the swelling potential of BCS.关键词
黑棉土/膨胀特性/黏土矿物/分子模拟/层间阳离子水化Key words
black cotton soil/swelling characteristics/clay minerals/molecular simulation/interlayer cation hydration分类
交通工程引用本文复制引用
程永振,黄晓明..基于层间阳离子水化的黑棉土黏土矿物膨胀研究[J].东南大学学报（英文版）,2021,37(3):299-305,7.基金项目
The National Natural Science Foundation of China(No.51778139),Jiangsu Planned Projects for Postdoctoral Research Funds (No.2020Z422). （No.51778139）
