孔隙溶液对粉质黏土界限含水率的影响

发布时间：2018-06-19 00:16

本文选题：粉质黏土 + 孔隙溶液　；参考：《岩土力学》2015年S1期

【摘要】：针对桂林地区的粉质黏土,运用液、塑限联合测定法探讨了不同孔隙溶液作用下土体的界限含水率,并利用扫描电镜(SEM)技术从微观层面分析了水化学环境变异下土体的水化学-力学耦合作用对结构特性造成的影响。试验结果表明,随着孔隙溶液浓度的增大,粉质黏土的界限含水率均减小,且在相同浓度下同价阳离子半径较小的水溶液使得粉质黏土界限含水率下降的较为明显,随着阳离子价位的增高,其下降的幅度更大;该现象的产生主要是由于离子浓度及离子价位的增大,使得扩散双电层的厚度减小,而双电层对于土体界限含水率存在直接的控制作用。除此以外,通过探测土体的微观结构发现,水化学-力学耦合作用使得粉质黏土颗粒间发生絮凝作用,致使土粒形成粒团,土颗粒间孔隙增大,架空孔隙变多。
[Abstract]:In view of silty clay in Guilin area, the limit moisture content of soil under the action of different pore solution was studied by the method of liquid and plastic limit. The influence of hydrochemical-mechanical coupling on the structure characteristics of soil under the variation of hydrochemical environment was analyzed by means of scanning electron microscope (SEM) technique. The experimental results show that with the increase of pore solution concentration, the limit moisture content of silty clay decreases, and the water solution with smaller cationic radius at the same concentration decreases the limit moisture content of silty clay obviously. With the increase of cationic price, the decrease of ion price is larger, which is mainly due to the increase of ion concentration and ion price, which makes the thickness of diffusion double electric layer decrease. And the double electric layer has the direct control function to the soil limit moisture content. In addition, by detecting the microstructure of soil mass, it is found that the coupling of hydrochemistry and mechanics results in flocculation between silty clay particles, resulting in the formation of particles, the increase of pores between soil particles and the increase of aerial pores.
【作者单位】：桂林理工大学广西建筑新能源与节能重点实验室;桂林理工大学广西岩土力学与工程重点实验室;中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室;
【基金】：国家自然科学基金(No.11372078,No.51309055) 广西自然科学基金(No.2012GXNSFGA060001,No.2012GXNSFBA053138) 广西岩土力学与工程重点实验室开放项目(No.11-KF-07)
【分类号】：TU442

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