Microstructural insight into permeability and water retention property of compacted binary silty clay
Microstructural insight into permeability and water retention property of compacted binary silty clay
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压实二元粉质粘土渗透性和保水性的微观结构研究
DOI：
10.1007/s11771-020-4431-x
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发表时间：
2020-07
影响因子：
4.4
通讯作者：
Jie Liu
中科院分区：
文献类型：
--
作者：
Qian-feng Gao;Zhen-ning Shi;Jin-tao Luo;Jie Liu
粉质粘土路堤的耐久性在一定程度上受水分运移的控制，而水分运移又取决于土体的水力学性质。本文对压实双粉质粘土的水力特性进行了试验研究。制备了不同混合比和干密度的样品。采用扫描电子显微镜和压汞孔隙仪对粉质粘土的微观结构进行了表征。在此基础上，分别进行了落水头渗透试验和保水试验，研究了其渗透性能和保水性能。结果表明，当粘土含量为100%时，粘土颗粒分散，压实后呈择优排列。随着粘土含量的降低，由于粉粒的存在，粘土颗粒的排列逐渐被扰乱，导致粉粒周围形成大的孔隙。随着干密度的增加，粉土颗粒周围的孔隙明显减少。粉质粘土的渗透性随粘粒含量和干密度的增加而减小，保水能力随粘粒含量和干密度的增加而增大。这是因为粘土含量和干密度较大的粉质粘土大孔隙较少，极大地抑制了水的流动。粉质粘土的渗透性和保水性能均可由孔径分布参数来预测。
The durability of silty clay embankments is partially controlled by the moisture migration, which depends on soil hydraulic properties. This paper presents an experimental study of hydraulic properties of compacted binary silty clay. Specimens with different mixing ratios and dry densities were prepared. Scanning electron microscopy and mercury intrusion porosimetry were used to characterise the microstructure of silty clay. Thereafter, falling-head permeability tests and water retention tests were conducted to study the permeability and water retention property, respectively. The results demonstrate that clay particles are dispersed and show preferred arrangements after compaction when the clay content is 100%. As the clay content decreases, the arrangement of clay particles is gradually disturbed because of the existence of silt particles, causing the formation of large pores around silt particles. When the dry density increases, the pores around silt particles significantly decrease. Moreover, the permeability of silty clay decreases but the water retention capacity increases with increasing clay content and dry density. This is because the silty clay with larger clay content and dry density has fewer large pores, which greatly restrains the flow of water. Both the permeability and water retention property of silty clay can be predicted from pore size distribution parameters.
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