干旱区生态环境知识资源中心(Arid): A Study on Characteristics of Unsaturated Sandy Soils Based on the CT Scanning Method

Arid

DOI	10.1007/s10553-021-01235-w
	A Study on Characteristics of Unsaturated Sandy Soils Based on the CT Scanning Method
	Zhao, Tian; Tang, Xian-chun; Wang, Gui-ling; Wan, Li; Wang, Xu-sheng; Zhang, Xin-xin
通讯作者	Tang, XC (corresponding author), Chinese Acad Geol Sci, Minist Nat Resources, China Geol Survey, Beijing 100037, Peoples R China. ; Tang, XC (corresponding author), Chinese Acad Geol Sci, SinoProbe Ctr, Minist Nat Resources, China Geol Survey, Beijing 100037, Peoples R China.
来源期刊	CHEMISTRY AND TECHNOLOGY OF FUELS AND OILS
ISSN	0009-3092
EISSN	1573-8310
出版年	2021
卷号	57 期号:1 页码:160-172
英文摘要	In the hydrologic cycle, sandy soils play the role of a connecting reservoir of surface water and groundwater, particularly in arid areas. Therefore, to provide water conservation and ecological environment protection, it is important to study the soil water behavior in the unsaturated zone. At present, the CT-scan method is commonly used to study the soil hydraulic properties. In the field of materials science, the industrial CT high-resolution instruments are applied for quantitative research on the porous microstructure and fluid filtration law in sandy soils. In this study, we have studied five samples of sand scans of the quartz sand and CUGB coarse sand types. The industrial-type CT instrument XTH225ST was used for the sample microstructure scanning. In order to identify water: air, and solid particle distribution of the sample cross section, and to analyze the particle size distribution and moisture content, the scanned images were processed using the VG-Studio and ImageJ software. Comparing the CT-scan results of the four quartz sand samples, it can be concluded that the optimal particle size, ranges from 1 to 2 mm. According to the porosity quantitative analysis, with decrease in the particle size, the total porosity grate soil sample increases. After applying the image recognition and VG- Studio software, we can see that for different particle sizes of the sand sample, the average pore size increases with increase in the particle size. To study the moisture absorption and desorption phenomenon, two samples of the CUGB coarse sand are experimentally studied. The particle size of the samples range: from 1 to 2 mm. The CT scanning analysis is used to obtain the unsaturated characteristic curve of the soil when the moisture content reaches stability. Due to the lag phenomenon, the characteristic curve of the soil moisture has an obvious loop, or hysteresis, shape. As shown by a 3D modeling, the distribution of capillary water in the sand column is complex, and the water flow forms multiple winding paths, like worms creeping in the soil. The CT-scan method is used to overcome the limitations of the traditional experimental methods and to evaluate the relationship between the moisture content and the matrix suction. The obtained characteristic curve of soil moisture can be used to improve the efficiency of technological operations. The CT-scan method provides a new way of evaluating the water distribution characteristics of unsaturated soil.
英文关键词	CT-scan capillary water porosity characteristic curve of soil moisture
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000636413200004
WOS类目	Energy & Fuels ; Engineering, Chemical ; Engineering, Petroleum
WOS研究方向	Energy & Fuels ; Engineering
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/349835
作者单位	[Zhao, Tian; Tang, Xian-chun; Wang, Gui-ling; Zhang, Xin-xin] Chinese Acad Geol Sci, Minist Nat Resources, China Geol Survey, Beijing 100037, Peoples R China; [Zhao, Tian; Tang, Xian-chun; Wang, Gui-ling; Zhang, Xin-xin] Chinese Acad Geol Sci, SinoProbe Ctr, Minist Nat Resources, China Geol Survey, Beijing 100037, Peoples R China; [Zhao, Tian; Wan, Li; Wang, Xu-sheng] China Univ Geosci, Beijing 100083, Peoples R China
推荐引用方式 GB/T 7714	Zhao, Tian,Tang, Xian-chun,Wang, Gui-ling,et al. A Study on Characteristics of Unsaturated Sandy Soils Based on the CT Scanning Method[J],2021,57(1):160-172.
APA	Zhao, Tian,Tang, Xian-chun,Wang, Gui-ling,Wan, Li,Wang, Xu-sheng,&Zhang, Xin-xin.(2021).A Study on Characteristics of Unsaturated Sandy Soils Based on the CT Scanning Method.CHEMISTRY AND TECHNOLOGY OF FUELS AND OILS,57(1),160-172.
MLA	Zhao, Tian,et al."A Study on Characteristics of Unsaturated Sandy Soils Based on the CT Scanning Method".CHEMISTRY AND TECHNOLOGY OF FUELS AND OILS 57.1(2021):160-172.