干旱区生态环境知识资源中心(Arid): Hydromechanical behavior and prediction of unsaturated loess over a wide suction range

Arid

DOI	10.12989/gae.2021.26.3.275
	Hydromechanical behavior and prediction of unsaturated loess over a wide suction range
	Jiang, Tong; Zhao, Jindi; Zhang, Junran; Wang, Lijin; Song, Chenyu; Zhai, Tianya
通讯作者	Zhang, JR (corresponding author), North China Univ Water Resources & Elect Power, Henan Prov Key Lab Geomech & Struct Engn, Zhengzhou 450045, Henan, Peoples R China.
来源期刊	GEOMECHANICS AND ENGINEERING
ISSN	2005-307X
EISSN	2092-6219
出版年	2021
卷号	26 期号:3 页码:275-288
英文摘要	Subgrade loess in arid and semi-arid regions subjected to high-suction conditions owing to low relative humidity and deep groundwater levels. Understanding the hydromechanical behavior of unsaturated compacted loess over a wide suction range is critical for resolving infrastructure problems in such areas. In this study, the water retention behavior of loess was investigated by imposing or measuring suction (s) using the axis translation technique, vapor equilibrium technique, and chilled mirror dew point technique. Triaxial tests were also performed to study the mechanical behavior of compacted loess under different net cell pressures (sigma(3n)). The soil-water retention curves obtained using the different techniques are consistent. The degree of saturation and water content decreases significantly when s 240 kPa, whereas the change of void ratio is relatively small. The water content versus s curves with different initial dry densities is coincident when s 0.5 MPa, indicating that undrained triaxial tests can be considered as those under constant suction. For the same sigma(3n), specimens show strain-hardening, shrinkage, and drum-shaped shear failure under low-s conditions and strain-softening, dilatancy, and oblique section splitting under high-s conditions. The failure deviator stress and cohesion of the compacted loess specimens increase with increasing s over the full s range (0-299.37 MPa). An equation to predict the shear strength of unsaturated loess over a wide s range is proposed. The intersection of the capillary water retention curve and adsorption water retention curve is set as a reference point (s(R)), where capillary degree of saturation is applicable for s <= s(R) and adsorption degree of saturation is added for s > s(R). The predicted and measured shear strengths of the compacted loess specimens are in good agreement.
英文关键词	adsorption degree of saturation capillary degree of saturation prediction shear strength soil-water retention curve unsaturated loess wide suction range
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000685643400006
WOS关键词	WATER CHARACTERISTIC CURVE ; SHEAR-STRENGTH ; COMPACTED LOESS ; SOIL ; STRESS ; SATURATION ; MICROSTRUCTURE ; DEFORMATION ; PARAMETERS ; EQUATIONS
WOS类目	Engineering, Civil ; Engineering, Geological
WOS研究方向	Engineering
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/363421
作者单位	[Jiang, Tong; Zhao, Jindi; Zhang, Junran; Wang, Lijin; Song, Chenyu; Zhai, Tianya] North China Univ Water Resources & Elect Power, Henan Prov Key Lab Geomech & Struct Engn, Zhengzhou 450045, Henan, Peoples R China
推荐引用方式 GB/T 7714	Jiang, Tong,Zhao, Jindi,Zhang, Junran,et al. Hydromechanical behavior and prediction of unsaturated loess over a wide suction range[J],2021,26(3):275-288.
APA	Jiang, Tong,Zhao, Jindi,Zhang, Junran,Wang, Lijin,Song, Chenyu,&Zhai, Tianya.(2021).Hydromechanical behavior and prediction of unsaturated loess over a wide suction range.GEOMECHANICS AND ENGINEERING,26(3),275-288.
MLA	Jiang, Tong,et al."Hydromechanical behavior and prediction of unsaturated loess over a wide suction range".GEOMECHANICS AND ENGINEERING 26.3(2021):275-288.