粉質(zhì)黏土路堤的耐久性在一定程度上受水分遷移控制,而后者取決于土的水力特性。本文研究了壓實二元粉質(zhì)黏土的水力特性。首先,按不同混合比和干密度制備了的二元粉質(zhì)黏土試樣,并利用掃描電鏡和壓汞儀分析了粉質(zhì)黏土的微觀結(jié)構(gòu)。然后,通過變水頭滲透試驗和持水性試驗,研究了粉質(zhì)黏土的滲透性和持水性。結(jié)果表明,當(dāng)黏土含量為100%時,壓實后黏土顆粒分散性良好,并呈現(xiàn)定向排列特征。隨著黏土含量降低,黏土顆粒的定向排列逐漸受到粉粒存在的干擾,導(dǎo)致粉粒周圍形成許多大孔隙。但粉粒周圍孔隙的數(shù)量隨著干密度的增加明顯減小。并且,隨著黏土含量和干密度的增加,粉質(zhì)黏土的滲透性降低而持水性增強。黏土含量和干密度越大,粉質(zhì)黏土中的孔隙越少,對水體流動的阻礙越強。粉質(zhì)黏土的滲透與持水特性均可通過孔徑分布特征參數(shù)進行預(yù)測。 

【文章頁數(shù)】：14 頁

【文章目錄】：
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


【參考文獻】：
期刊論文
[1]酶法提高黏性土回彈模量（英文）[J]. Ahmed F.ZIDAN,Abdullah A.ABOUKHADRA,Yasser GABER.  Journal of Central South University. 2019(09)
[2]基于微觀層析成像技術(shù)的花崗巖殘積土顆粒接觸方式研究（英文）[J]. 孫銀磊,湯連生.  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]. 張崇磊,蔣關(guān)魯,劉先峰,王智猛.  Journal of Central South University. 2015(04)



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