Swelling characteristics of soils derived from black shales heightened by cations in Northern Chongqing, China

CORC > 成都山地灾害与环境研究所 > 中国科学院水利部成都山地灾害与环境研究所 > Journal of Mountain Science > Journal of Mountain Science-2016 > Vol13 No.6

	Swelling characteristics of soils derived from black shales heightened by cations in Northern Chongqing, China
	LI Xiao-ning; ZHU Bao-long; WU Xi-yong
刊名	Journal of Mountain Science
	2016-06
卷号	13 期号:6 页码:1107-1119
关键词	Black shale Swelling rate Swelling force Cation
ISSN号	1672-6316
通讯作者	WU Xi-yong
英文摘要	Black shale is widely distributed in southern and western China. The swelling and breakdown characteristics of black shale are important physicomechanical properties in engineering activities. Aqueous solutions with different compositions exert various influences on the swelling characteristic of black shale because of the complexity of its composition. Soils derived from black shale are most commonly developed on black shales with bedded horizons that generally have cutting and weathering profiles. This paper reports an axial free swelling study for soils derived from black shales and developed in the Lower Cambrian black shales in Chengkou County, Chongqing Municipality, Southwest China. To discuss the swelling characteristics of black shale under the influence of cations, an axial free swelling test was conducted on black shale samples while considering the initial water content, weathering stage of black shale, and different cationic solutions with various concentrations. Results showed that the swelling deformation curve of black shale could be divided into three phases: acceleration, deceleration, and stability. The axial swelling ratio eventually decreased with increasing water content, and the axial free swelling rate changed with the free expansion model of the exponential relationship. Under a constant initial water content, the axial swelling rate increased with the intensity of black shale weathering in the same immersion solution. When different types of immersion solutions were used, the cationic price was high and the axial swelling rate increased with rising cation valence. The changes in the swelling ratio were significant at a valence of one or two. The results of this study provide further understanding of the engineering geological characteristics of black shale and the geological hazards caused by the swelling characteristics of black shale.
收录类别	SCI
语种	英语
内容类型	期刊论文
源URL	[http://ir.imde.ac.cn/handle/131551/17225]
专题	成都山地灾害与环境研究所_Journal of Mountain Science _Journal of Mountain Science-2016_Vol13 No.6
推荐引用方式 GB/T 7714	LI Xiao-ning,ZHU Bao-long,WU Xi-yong. Swelling characteristics of soils derived from black shales heightened by cations in Northern Chongqing, China[J]. Journal of Mountain Science,2016,13(6):1107-1119.
APA	LI Xiao-ning,ZHU Bao-long,&WU Xi-yong.(2016).Swelling characteristics of soils derived from black shales heightened by cations in Northern Chongqing, China.Journal of Mountain Science,13(6),1107-1119.
MLA	LI Xiao-ning,et al."Swelling characteristics of soils derived from black shales heightened by cations in Northern Chongqing, China".Journal of Mountain Science 13.6(2016):1107-1119.