Experimental study of steady seepage in unsaturated loess soil

doi:10.1007/s11440-020-00948-2

	Experimental study of steady seepage in unsaturated loess soil
	Tian, Kanliang 1,2; Yang, Aoqiu 2; Nie, Kangyi 3; Zhang, Huili 3; Xu, Jin 3; Wang, Xiaodong 2
刊名	ACTA GEOTECHNICA
	2020-09-01
卷号	15 期号:9 页码:2681-2689
关键词	Matric suction Permeability coefficient Seepage law Steady seepage Unsaturated soil
ISSN号	1861-1125
DOI	10.1007/s11440-020-00948-2
通讯作者	Zhang, Huili(huilizhang163@163.com)
英文摘要	The complexity of unsaturated soil means that its permeability coefficient and seepage law are important topics in soil mechanics and geotechnical engineering. In this study, a new type of equipment for measuring the seepage of unsaturated soil was used to study the steady seepage of unsaturated loess soil collected from northern Shaanxi province in China. The entire process of the steady seepage of unsaturated soil under different seepage hydraulic gradients was obtained, and the permeability coefficient in the steady seepage state was measured. When the soil water content was low, the soil moisture remained only in small pores or at the junction of soil particles, the effective seepage area of the sample was reduced, and the seepage path was extended. Therefore, the lower the water content, the smaller the permeability coefficient of unsaturated soil and the longer the time required for the seepage to reach a steady state. The matric suction of the unsaturated loess soil was measured under different water contents. With decreasing water content, water remained only in the smaller pores, which provided shrink films with a smaller radius of curvature. This allowed the shrink films to withstand a larger pore air pressure and transmit a smaller pore water pressure, so that the matric suction of the loess soil increased with decreasing soil water content. The Gardner model provided an accurate fit of how the matric suction varied with the volumetric water content of the unsaturated soil. The seepage velocity and seepage hydraulic gradient were correlated well with a linear relationship, indicating that the seepage law of unsaturated loess soil accords with Darcy's law. The experimental results show that the new unsaturated soil permeameter has good performance and controllability, thereby providing support for studying the steady seepage of unsaturated soil.
WOS关键词	HYDRAULIC CONDUCTIVITY ; PERMEABILITY ; WATER
WOS研究方向	Engineering
语种	英语
出版者	SPRINGER HEIDELBERG
WOS记录号	WOS:000554784100019
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/158252]
专题	中国科学院地理科学与资源研究所
通讯作者	Zhang, Huili
作者单位	1.Chinese Acad Sci & Minist Water Resources, Inst Soil & Water Conservat, Yangling 712100, Shaanxi, Peoples R China 2.Northwest A&F Univ, Inst Soil & Water Conservat, Yangling 712100, Shaanxi, Peoples R China 3.Northwest A&F Univ, Coll Water Resources & Architectural Engn, Yangling 712100, Shaanxi, Peoples R China
推荐引用方式 GB/T 7714	Tian, Kanliang,Yang, Aoqiu,Nie, Kangyi,et al. Experimental study of steady seepage in unsaturated loess soil[J]. ACTA GEOTECHNICA,2020,15(9):2681-2689.
APA	Tian, Kanliang,Yang, Aoqiu,Nie, Kangyi,Zhang, Huili,Xu, Jin,&Wang, Xiaodong.(2020).Experimental study of steady seepage in unsaturated loess soil.ACTA GEOTECHNICA,15(9),2681-2689.
MLA	Tian, Kanliang,et al."Experimental study of steady seepage in unsaturated loess soil".ACTA GEOTECHNICA 15.9(2020):2681-2689.