Inhibition effect of swelling characteristics of expansive soil using cohesive non-swelling soil layer under unidirectional seepage

doi:10.1016/j.jrmge.2019.07.008

	Inhibition effect of swelling characteristics of expansive soil using cohesive non-swelling soil layer under unidirectional seepage
	Yao, Hailin 3,4; She, Jianbo 2,4; Lu, Zheng 3,4; Luo, Xingwen 4; Xian, Shaohua 2,4; Fang, Ran 2,4; Chen, Zhenzhong 1
刊名	JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING
	2020-02-01
卷号	12 期号:1 页码:188-196
关键词	Cohesive non-swelling soil (CNS) Expansive soil Unidirectional seepage Electric charge effect Swelling inhibition mechanism
ISSN号	1674-7755
DOI	10.1016/j.jrmge.2019.07.008
英文摘要	Cohesive non-swelling soil (CNS) cushion technology is widely used to solve swelling deformation problems in expansive soil areas. However, the swelling inhibition mechanism is still not fully understood. In this study, the inhibition effect on expansive soil using a CNS layer was studied by performing five types of laboratory model tests under unidirectional seepage. The results showed that CNS cushion technology produced a sound inhibition effect on the swelling characteristics of expansive soil. It was shown that the cations in the CNS layer moved downward and accumulated on the surface of solids and produced an electrical environment inside the expansive soil. In this process, the adsorbed hydrated cations participated in ion exchange with the expansive soil, leading to the modification effect on its swelling potential. Meanwhile, the adsorbed water membrane surrounding the expansive soil aggregates formed by the hydrated cations obstructed further adsorption of water molecules, which inhibited the swelling development of expansive soil. Therefore, the swelling inhibition mechanism can be attributed to three factors: (i) modification effect, (ii) electrical environment, and (iii) deadweight of the CNS layer. The combined contribution of modification effect and electrical environment can be considered as an electric charge effect, which mainly controls the swelling characteristics of expansive soil. (C) 2020 Institute of Rock and Soil Mechanics, Chinese Academy of Sciences. Production and hosting by Elsevier B.V.
资助项目	Outstanding Youth Foundation of Hubei Province, China[2017CFA056] ; National Natural Science Foundation of China[41672312] ; National Natural Science Foundation of China[41972294]
WOS研究方向	Engineering
语种	英语
出版者	SCIENCE PRESS
WOS记录号	WOS:000512965400017
内容类型	期刊论文
源URL	[http://119.78.100.198/handle/2S6PX9GI/23395]
专题	中科院武汉岩土力学所
通讯作者	Lu, Zheng
作者单位	1.Sanjiang Engn Construct Adm Bur Heilongjiang Prov, Harbin, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Hubei Key Lab Geoenvironm Engn, Wuhan 430071, Peoples R China 4.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Peoples R China
推荐引用方式 GB/T 7714	Yao, Hailin,She, Jianbo,Lu, Zheng,et al. Inhibition effect of swelling characteristics of expansive soil using cohesive non-swelling soil layer under unidirectional seepage[J]. JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING,2020,12(1):188-196.
APA	Yao, Hailin.,She, Jianbo.,Lu, Zheng.,Luo, Xingwen.,Xian, Shaohua.,...&Chen, Zhenzhong.(2020).Inhibition effect of swelling characteristics of expansive soil using cohesive non-swelling soil layer under unidirectional seepage.JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING,12(1),188-196.
MLA	Yao, Hailin,et al."Inhibition effect of swelling characteristics of expansive soil using cohesive non-swelling soil layer under unidirectional seepage".JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING 12.1(2020):188-196.