干旱区生态环境知识资源中心(Arid): Investigating microscale structural characteristics and resultant macroscale mechanical properties of loess exposed to alkaline and saline environments

Arid

DOI	10.1007/s10064-022-02640-z
	Investigating microscale structural characteristics and resultant macroscale mechanical properties of loess exposed to alkaline and saline environments
	Wang, Lin; Cheng, Wen-Chieh; Xue, Zhong-Fei
通讯作者	Cheng, WC
来源期刊	BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT
ISSN	1435-9529
EISSN	1435-9537
出版年	2022
卷号	81 期号:4
英文摘要	Due to the monsoon climate, saline soils extensively spread over the arid or semi-arid area (e.g. NW China) and are featured with notable dissolution collapsibility and salt expandability. The features cause road hump and subgrade corrosion towards endangering the safety of passers. In this study, the microstructural evolution of the loess when subjected to alkaline and saline environments was investigated using a series of microscale tests, including scanning electron microscopic (SEM), X-ray diffraction (XRD), energy-dispersive X-ray spectroscopy (SEM-EDS), and mercury intrusion porosimetry (MIP). The correspondence of the microstructural evolution with the macroscale mechanical properties using the reduced triaxial extension tests was studied. The test results showed that the alkaline and saline environments led to the microstructural evolution of the loess, involving the particle morphology, microstructural characteristics, pore distribution, and directionality of the pores. The increasing thickness of the diffuse double layer, induced by sodium sulphate, reduced the suction and deteriorated the microstructural characteristics, causing a degradation of the macroscale mechanical properties. Under sodium hydroxide conditions, a distinct transformation from granular structures to an agglomerated structure was attributed to the formation of sodium silicate, and the surface-surface connections were formed at the same time, which also indicated an enhancement of the microstructural characteristics. The enhanced microstructural characteristics contributed to the improvement in the macroscale mechanical properties. The findings of this study provide some design guideposts for preventing and mitigating the degradation of subgrade when exposed to saline environments.
英文关键词	Loess soil Chemical treatment Mechanical properties Reduced triaxial extension test
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000768826600001
WOS关键词	CEMENTED PASTE BACKFILL ; CHEMICAL BEHAVIOR ; CONTAMINATION ; PLATEAU ; SOILS ; LANDSLIDES ; COLLAPSE
WOS类目	Engineering, Environmental ; 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/2XILL650/392042
推荐引用方式 GB/T 7714	Wang, Lin,Cheng, Wen-Chieh,Xue, Zhong-Fei. Investigating microscale structural characteristics and resultant macroscale mechanical properties of loess exposed to alkaline and saline environments[J],2022,81(4).
APA	Wang, Lin,Cheng, Wen-Chieh,&Xue, Zhong-Fei.(2022).Investigating microscale structural characteristics and resultant macroscale mechanical properties of loess exposed to alkaline and saline environments.BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT,81(4).
MLA	Wang, Lin,et al."Investigating microscale structural characteristics and resultant macroscale mechanical properties of loess exposed to alkaline and saline environments".BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT 81.4(2022).