干旱区生态环境知识资源中心(Arid): Investigation on Compressibility and Microstructure Evolution of Intact Loess at Different Wetting States

Arid

DOI	10.3389/feart.2022.923358
	Investigation on Compressibility and Microstructure Evolution of Intact Loess at Different Wetting States
	Jian, Tao; Kong, Lingwei; Bai, Wei; Sun, Zhiliang
通讯作者	Bai, W
来源期刊	FRONTIERS IN EARTH SCIENCE
EISSN	2296-6463
出版年	2022
卷号	10
英文摘要	Loess is widely deposited in arid and semi-arid areas and is characterized by low dry density, developed pore space, and loose structure, which is not commensurate with high structural strength and shear strength in the dry state. Many natural phenomena and experimental results show that intact loess is very sensitive to the change of water content, and a slight increase in water content can cause a rapid reduction in strength. Abundant information is available in the literature for the collapsibility of loess. However, research on the evolution of loess compressibility during wetting, which is very helpful in understanding loess collapsible deformation caused by long-term irrigation, remains minimal. To this end, in this article, the evolution of the compressibility of intact loess at different wetting stages is investigated by oedometer tests, and microstructure and pore size distribution (PSD) were characterized on intact loess specimens at different water contents before and after oedometer tests by scanning electron microscope (SEM) and mercury intrusion porosimetry (MIP) methods. The results show that the compression index (C-c) and secondary compression index (C-alpha) of intact loess depend on water content and vertical stress and change abruptly when vertical stress exceeds yield stress. C-alpha/C-c values of intact loess are not constant, which increases with vertical stress to a peak and then gradually decreases to 0.025. Wetting and loading can cause damage to the microstructure of intact loess; specifically, loading leads to the collapse of the overhead structure and the transformation from a bimodal PSD into a unimodal PSD, and wetting intensifies the collapse of the microstructure to form a compacted interlocking structure and promotes the transformation of medium pores into small pores.
英文关键词	intact loess water content compressibility microstructure SEM MIP
类型	Article
语种	英语
开放获取类型	gold
收录类别	SCI-E
WOS记录号	WOS:000828411100001
WOS关键词	COLLAPSE BEHAVIOR ; SHAANXI PROVINCE ; REMOLDED LOESS ; MALAN LOESS ; SOIL ; COLLAPSIBILITY ; LOESSIFICATION ; MECHANISM ; DEPOSITS ; CHINA
WOS类目	Geosciences, Multidisciplinary
WOS研究方向	Geology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/392676
推荐引用方式 GB/T 7714	Jian, Tao,Kong, Lingwei,Bai, Wei,et al. Investigation on Compressibility and Microstructure Evolution of Intact Loess at Different Wetting States[J],2022,10.
APA	Jian, Tao,Kong, Lingwei,Bai, Wei,&Sun, Zhiliang.(2022).Investigation on Compressibility and Microstructure Evolution of Intact Loess at Different Wetting States.FRONTIERS IN EARTH SCIENCE,10.
MLA	Jian, Tao,et al."Investigation on Compressibility and Microstructure Evolution of Intact Loess at Different Wetting States".FRONTIERS IN EARTH SCIENCE 10(2022).