钠基、钙基蒙脱石低含水率状态下基质势能的多元动力学研究  

METADYNAMICS STUDY OF MATRIC POTENTIAL IN SODIUM AND CALCIUM MONTMORILLONITES UNDER LOW MOISTURE CONTENT

作　　者：江舒棋 赵红华[1,2] 张超[3] 张大帅 王小红[1,2] JIANG Shu-qi;ZHAO Hong-hua;ZHANG Chao;ZHANG Da-shuai;WANG Xiao-hong(State Key Laboratory of Structural Analysis for Industrial Equipment,Dalian 116024,China;Department of Engineering Mechanics,Dalian University of Technology,Dalian 116024,China;School of Civil Engineering,Hu’nan University,Changsha 410082,China)

机构地区：[1]工业装备结构分析国家重点实验室,大连116024 [2]大连理工大学工程力学系,大连116024 [3]湖南大学土木工程学院,长沙410082

出　　处：《工程力学》2022年第4期230-237,共8页Engineering Mechanics

基　　金：国家自然科学基金项目(90715035)。

摘　　要：基于分子动力学和元动力学(Metadynamics)的研究方法,探索了钠基蒙脱石和钙基蒙脱石在低含水率状态下的基质吸力,建立了含水率在5%~30%的土水特征曲线,通过曲线对比发现钠基蒙脱石与钙基蒙脱石的基质吸力均随含水率的升高而指数下降,并且在含水率小于20%时,钠基蒙脱石的基质吸力略小于钙基蒙脱石,含水率大于20%后钠基蒙脱石基质吸力略大于钙基蒙脱石。得到钠基蒙脱石在5%含水率时的基质吸力约为4.2 GPa,钙基蒙脱石在5%含水率时的基质吸力约为4.4 GPa。该研究结果为众多吸力测量的实验值和理论模型提出的预测值提供了参考。Based on molecular dynamics and Metadynamics, the matric potential of the sodium montmorillonite and calcium montmorillonite at low moisture content conditions are discussed. And the soil water characteristic curve is established at a moisture content range of 5%-30%. The matric suction of sodium montmorillonite and calcium montmorillonite are found to decline exponentially with the increase of moisture content. When the moisture content is less than 20%, the matric suction of sodium montmorillonite is slightly less than calcium montmorillonite. When moisture content is more than 20%, the matric suction of sodium montmorillonite is slightly larger than that of calcium montmorillonite. The matric suction of sodium montmorillonite is about4.2 GPa at the moisture content of 5%, and the matric suction of calcium montmorillonite is about 4.4 GPa. These methods and results provide references for suction measurements by experiment or predicted values by theoretical models.

关 键 词：蒙脱石 分子动力学 元动力学 基质势能 土水特征曲线 

分 类 号：TU411.92[建筑科学—岩土工程]