干旱区生态环境知识资源中心(Arid): Study on water migration and the microstructure of unsaturated expansive clays

Arid

DOI	10.1144/qjegh2023-067
	Study on water migration and the microstructure of unsaturated expansive clays
	Liu, Qiuyan; Wang, Mingwu
通讯作者	Liu, QY
来源期刊	QUARTERLY JOURNAL OF ENGINEERING GEOLOGY AND HYDROGEOLOGY
ISSN	1470-9236
EISSN	2041-4803
出版年	2024
卷号	57 期号:2
英文摘要	Because of the characteristics of water swelling and drying shrinkage, the mechanical performance of expansive clays in semi-arid areas deteriorates with changes in humidity and temperature. Hence, investigating the moisture migration in expansive clays is of great significance. Herein, scanning electron microscopy and water migration tests of unsaturated soil were carried out to address the water variation law and microscopic mechanisms in unsaturated expansive clays. It was found that small- and medium-sized pores (2-10 mu m) are dominant, and these pores are conducive to an increase in the water content in the soil. Soil with a high water content exhibits a flocculent structure, characterized by a small fractal dimension and a high relative hydraulic conductivity. Conversely, soil with a low water content displays a dispersed structure, featuring a large fractal dimension and a low relative hydraulic conductivity. The water migration tests, which were carried out at constant temperatures (5, 20 and 40 degrees C) and variable temperatures (15-25 degrees C), show that the amount of migration at 5 and 20 degrees C was about 25-40 and 40-60% of that at 40 degrees C, respectively. The amount of water migration at a constant temperature was obviously lower than that recorded at variable temperatures. The research results have provided technical support for the effective control of soil change.
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:001179550800001
WOS关键词	HYDRAULIC CONDUCTIVITY ; LIQUID WATER ; SOIL-WATER ; MOISTURE MIGRATION ; SWELLING BEHAVIOR ; VAPOR ; TRANSPORT ; HEAT ; EVAPORATION ; MODEL
WOS类目	Engineering, Geological ; Geosciences, Multidisciplinary
WOS研究方向	Engineering ; Geology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/405238
推荐引用方式 GB/T 7714	Liu, Qiuyan,Wang, Mingwu. Study on water migration and the microstructure of unsaturated expansive clays[J],2024,57(2).
APA	Liu, Qiuyan,&Wang, Mingwu.(2024).Study on water migration and the microstructure of unsaturated expansive clays.QUARTERLY JOURNAL OF ENGINEERING GEOLOGY AND HYDROGEOLOGY,57(2).
MLA	Liu, Qiuyan,et al."Study on water migration and the microstructure of unsaturated expansive clays".QUARTERLY JOURNAL OF ENGINEERING GEOLOGY AND HYDROGEOLOGY 57.2(2024).