Characterizing saturation state of loess using P-wave velocity

doi:10.1016/j.enggeo.2021.106207

	Characterizing saturation state of loess using P-wave velocity
	Zhang, Ning 1; Liu, Xin 1; Lan, Hengxing 1,2
刊名	ENGINEERING GEOLOGY
	2021-09-05
卷号	290 页码:7
关键词	P-wave velocity B-value Saturation Water content Pore connection
ISSN号	0013-7952
DOI	10.1016/j.enggeo.2021.106207
通讯作者	Liu, Xin(xliu67@chd.edu.cn)
英文摘要	A conventional approach to characterize the degree of saturation of soils uses the pore pressure parameter, also known as B-value in laboratory experiments. Given a recent advance that the P-wave velocity was derived as a function of the B-value with progressive saturation based on the poroelasticity theory, it sheds a light on applicability of the P-wave velocity to evaluate saturation of soils in an effective manner. Yet, previous studies in this regard often focus on granular materials, the feasibility of using the relationship for cohesive soils, such as loess, was less extensively studied and remained poorly understood. This paper presents an experimental study on the P-wave velocity of loess using a pair of piezoceramic extender elements at a sequence of saturation states. Moist tamping method was used to prepare loess samples of different water contents (5% and 14%), and the influence of initial water content on the relationship between the P-wave velocity and the B-value was examined. It was found that, in general, as the B-value increases, the P-wave arrives earlier for the loess specimen having a lower initial water content (5%). Though the P-wave velocity increases with the B-value, that is approximately in line with theoretical predictions, departures from predictions were observable at higher B-values. A relevant hypothesis was given that attributed the observed discrepancies to the local variation of pore connections and the associated distribution of air bubbles in the specimen. Correspondently, numerical evidences were also provided by using the program FLAC3D.
资助项目	National Natural Science Foundation of China[41927806] ; National Natural Science Foundation of China[42041006] ; National Natural Science Foundation of China[41807226] ; Fundamental Research Funds for the Central Universities through Changan University, China[300102260201] ; 111 Center, program of the Ministry of Education of China[B18046]
WOS关键词	B-VALUE ; RESISTANCE ; SAND ; LIQUEFACTION
WOS研究方向	Engineering ; Geology
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:000660033700009
资助机构	National Natural Science Foundation of China ; Fundamental Research Funds for the Central Universities through Changan University, China ; 111 Center, program of the Ministry of Education of China
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/164090]
专题	中国科学院地理科学与资源研究所
通讯作者	Liu, Xin
作者单位	1.Changan Univ, Coll Geol Engn & Geomat, Xian, Peoples R China 2.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, LREIS, Beijing 100864, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Ning,Liu, Xin,Lan, Hengxing. Characterizing saturation state of loess using P-wave velocity[J]. ENGINEERING GEOLOGY,2021,290:7.
APA	Zhang, Ning,Liu, Xin,&Lan, Hengxing.(2021).Characterizing saturation state of loess using P-wave velocity.ENGINEERING GEOLOGY,290,7.
MLA	Zhang, Ning,et al."Characterizing saturation state of loess using P-wave velocity".ENGINEERING GEOLOGY 290(2021):7.