干旱区生态环境知识资源中心(Arid): Density and salinity effects on the water retention capacity of unsaturated clayey dispersive soil

Arid

DOI	10.1007/s11368-023-03545-4
	Density and salinity effects on the water retention capacity of unsaturated clayey dispersive soil
	Han, Yan; Wang, Qing; Liu, Jing; Lu, Wenxi
通讯作者	Wang, Q
来源期刊	JOURNAL OF SOILS AND SEDIMENTS
ISSN	1439-0108
EISSN	1614-7480
出版年	2023
卷号	23 期号:9 页码:3285-3297
英文摘要	PurposeWater retention capacity (WRC) is crucial for assessing the hydro-physical behavior of unsaturated soils. Dispersive soil, erodible and found mainly in arid regions, lacks sufficient WRC knowledge, hindering its stability evaluation in unsaturated state. This study aimed to explore the WRC of dispersive soil by measuring its matric suction (psi) under coupling effects of dry density (rho(d)) and soluble salt content (eta).Materials and methodCompacted specimens with different rho(d) and eta were prepared. For each rho(d)-eta case, six levels of soil mass water content were considered and the psi was measured via filter paper method. Soil water characteristic curves (SWCCs) were fitted by van Genuchten model.Results and discussionThe WRC of dispersive soil enhances as rho(d) increases. Increasing eta first weakens then strengthens the WRC, showing suction dependence. The air-entry value and residual state suction range within 0.95-17.8 kPa and 15.7-98.4 MPa, respectively. As for the air-entry value, increasing eta from 0.3% to 2.0% decreases it from 36.0% to 58.7% when rho(d) increases, and its average growth rate changes from 174.5% to 265.3% when rho(d) exceeds 1.53 g/cm(3). Increasing rho(d) reduces the average water loss rate of SWCC transition stage, while the impact of eta is nonmonotonic, with an inflection point at 1.0%.ConclusionsThe rho(d) and eta influenced the WRC of dispersive soil individually and interactively. The effect of rho(d) links to the water release sequence from pores of different sizes, whereas that of eta, rather complex and non-monotonic, relates to clay electrochemistry and salt phase.
英文关键词	Dispersive soil Water retention capacity Soil density Soil salinity van Genuchten SWCC
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:001000750400002
WOS关键词	INITIAL DRY DENSITY ; CHARACTERISTIC CURVE ; SIZE DISTRIBUTION ; SHEAR-STRENGTH ; BEHAVIOR ; MICROSTRUCTURE ; SUCTION ; STRESS
WOS类目	Environmental Sciences ; Soil Science
WOS研究方向	Environmental Sciences & Ecology ; Agriculture
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/397571
推荐引用方式 GB/T 7714	Han, Yan,Wang, Qing,Liu, Jing,et al. Density and salinity effects on the water retention capacity of unsaturated clayey dispersive soil[J],2023,23(9):3285-3297.
APA	Han, Yan,Wang, Qing,Liu, Jing,&Lu, Wenxi.(2023).Density and salinity effects on the water retention capacity of unsaturated clayey dispersive soil.JOURNAL OF SOILS AND SEDIMENTS,23(9),3285-3297.
MLA	Han, Yan,et al."Density and salinity effects on the water retention capacity of unsaturated clayey dispersive soil".JOURNAL OF SOILS AND SEDIMENTS 23.9(2023):3285-3297.