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基于微观结构的压实二元粉质黏土渗透与持水特性(英文)

发布时间:2023-01-14 15:26
  粉质黏土路堤的耐久性在一定程度上受水分迁移控制,而后者取决于土的水力特性。本文研究了压实二元粉质黏土的水力特性。首先,按不同混合比和干密度制备了的二元粉质黏土试样,并利用扫描电镜和压汞仪分析了粉质黏土的微观结构。然后,通过变水头渗透试验和持水性试验,研究了粉质黏土的渗透性和持水性。结果表明,当黏土含量为100%时,压实后黏土颗粒分散性良好,并呈现定向排列特征。随着黏土含量降低,黏土颗粒的定向排列逐渐受到粉粒存在的干扰,导致粉粒周围形成许多大孔隙。但粉粒周围孔隙的数量随着干密度的增加明显减小。并且,随着黏土含量和干密度的增加,粉质黏土的渗透性降低而持水性增强。黏土含量和干密度越大,粉质黏土中的孔隙越少,对水体流动的阻碍越强。粉质黏土的渗透与持水特性均可通过孔径分布特征参数进行预测。 

【文章页数】:14 页

【文章目录】:
1 Introduction
2 Material properties
3 Experimental program
    3.1 Specimen preparation
    3.2 Microscopic test
        3.2.1 Preparation of small samples
        3.2.2 SEM observation
        3.2.3 MIP test
    3.3 Macroscopic test
        3.3.1 Permeability test
        3.3.2 Water retention test
4 Results and discussion
    4.1 Morphological analyses
    4.2 Pore size distribution
    4.3 Soil permeability
        4.3.1 Test results and microscopic mechanism
        4.3.2 Permeability equations
    4.4 Soil water retention property
        4.4.1 Test results and microscopic mechanism
        4.4.2 Soil water retention equations
5 Conclusions


【参考文献】:
期刊论文
[1]酶法提高黏性土回弹模量(英文)[J]. Ahmed F.ZIDAN,Abdullah A.ABOUKHADRA,Yasser GABER.  Journal of Central South University. 2019(09)
[2]基于微观层析成像技术的花岗岩残积土颗粒接触方式研究(英文)[J]. 孙银磊,汤连生.  Journal of Central South University. 2019(04)
[3]Lateral displacement of silty clay under cement-fly ash-gravel pile-supported embankments: Analytical consideration and field evidence[J]. 张崇磊,蒋关鲁,刘先峰,王智猛.  Journal of Central South University. 2015(04)



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