摘要
采用压汞试验和扫描电镜试验,对不同干密度(1.3,1.5,1.7 g/cm^3)的压实膨胀土试样受不同浓度(0.0,0.5,1.0,2.0 mol/L)的NaCl溶液饱和后微观结构的演化进行了详细研究.压汞试验结果表明:NaCl溶液对土中小、微孔隙的影响显著,随着NaCl溶液浓度的增加,小、微孔隙减少,且这种影响随着初始干密度的增加而更为明显.扫描电镜图像显示出NaCl溶液浓度对黏土微观结构的整体形态影响非常明显,钠离子浓度增加后,土颗粒集聚化,使土体表现得非常致密,土中出现架空贯穿孔隙.
Relying on mercury intrusion porosimetry and scanning electron microscopy microstructure investigation,a detailed analysis of the microstructure evolution for the compacted expansive soil specimens with different initial dry densities(1.3,1.5,1.7 g/cm^3)saturated in salt solutions with different concentrations(0.0,0.5,1.0,2.0 mol/L)was made.Mercury intrusion porosimetry results show that the NaCl solutions have a marked influence on small and micro pores,and the numbers of small and micro pores reduce with increasing NaCl solution concentrations.Such effect is more obvious when the initial dry density increases.Scanning electron microscopy photos show that pore fluids possess a significant influence on the global form of the expansive clay microstructure.In addition,the electric double layers are compacted with increasing Na+concentration,leading to the aggregation of soil particles and the presence of relatively large interconnected pores.
作者
蔺建国
叶加兵
邹维列
LIN Jianguo;YE Jiabing;ZOU Weilie(School of Civil Engineering,Wuhan University,Wuhan 430072,China;Hubei Provincial Key Laboratory of Safety for Geotechnical and Structural Engineering,Wuhan University,Wuhan 430072,China)
出处
《华中科技大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2020年第4期12-17,共6页
Journal of Huazhong University of Science and Technology(Natural Science Edition)
基金
国家自然科学基金资助项目(51779191).
关键词
膨胀土
微观结构
孔隙溶液
双电层
压汞试验
expensive soil
microstructure
pore fluid
double electric layers
mercury intrusion porosimetry
作者简介
蔺建国(1995-),男,博士研究生,E-mail:919209008@qq.com.
