水土保持通报2018，Vol.38Issue(2)：95-101,7.DOI:10.13961/j.cnki.stbctb.2018.02.016
不同黏粒含量对黄土渗透系数影响的试验研究
Experimental Study on Permeability Coefficient of Loess with Different Clay Content
摘要
Abstract
[Objective] An experiment focused on the effect of different clay content on the permeability coefficient of loess was carried out,to reveal the influence of clay content on the permeability coefficient and its microscopic mechanism,and then to provide a scientific basis for the permeability of theory and engineering practice of loess.[Methods] Self-made wet sieve device under negative pressure was applied to screen loess samples with different clay content.Laser particle analyzer was carried out to track measurement clay content of the loess soil.Different clay content of the loess samples were made to the natural dry density,butwith different moisture content using static pressure method,and then saturated by infiltration experiment.[Results] The clay content of the loess had a great influence on its permeability.For samples with the same moisture content,the permeability of loess reduced gradually as the clay content increased.In addition,permeability coefficient exhibited an exponential and negative relationship with the content of clay as independent variable.The permeability coefficient decreased with the increase of the initial water content for those samples with same clay content.With the increase of clay content,the microstructure of loess samples changed from a dispersed structure to a dense structure.The contact of some particles changed from bracket contact to mosaic contact.The particle connections were connected or bridged into embedded connections.The pores changed from stent macroporous to small ones among clay particles,whereby the permeability of the loess was reduced to some extent.[Conclusion] The responses of the permeability coefficient of loess to clay content and moisture content were similar.Its impact mechanism can be explained by the microstructure.关键词
黄土/负压湿筛/黏粒含量/渗透系数/微观结构Key words
loess/negative pressure wet screen/clay particle content/permeability coefficient/microstructure分类
建筑与水利引用本文复制引用
王力,李喜安,何军,洪勃,李林翠..不同黏粒含量对黄土渗透系数影响的试验研究[J].水土保持通报,2018,38(2):95-101,7.基金项目
国家自然科学基金项目“基于三维微观结构的黄土湿陷性成因及潜蚀黄土场地湿陷机理研究”(41572264) （41572264）
