Experimental Investigation on the Influence of Thermochemical Effect on the Pore-Water Status in Expansive Soil

doi:10.1061/(ASCE)GM.1943-5622.0002020

	Experimental Investigation on the Influence of Thermochemical Effect on the Pore-Water Status in Expansive Soil
	Yao, Chuanqin 1,2,3; Wei, Changfu 2,4; Ma, Tiantian 2; Chen, Pan 2; Tian, Huihui 2
刊名	INTERNATIONAL JOURNAL OF GEOMECHANICS
	2021-06-01
卷号	21 期号:6 页码:11
关键词	Expansive soil Pore-water status Temperature Saline solution Nuclear magnetic resonance (NMR)
ISSN号	1532-3641
DOI	10.1061/(ASCE)GM.1943-5622.0002020
英文摘要	The pore-water status, including adsorptive and capillary water, in expansive clay with different dry densities was investigated under the effect of temperature and saline solution via the nuclear magnetic resonance technique. Combined with a method of distinguishing the adsorptive and capillary water, the variations in the adsorptive water content with the thermochemical effect were obtained quantitatively. The experimental results show that the adsorptive water content decreases as the temperature increases, consistent with the theoretical conclusion, which is considered to be attributed to the increase of the chemical potential and the activity of the pore water. On the other hand, the volume of micropores decreases while the volume of macropores increases with the increasing temperature or concentration, resulting from the flocculation and agglomeration of soil particles. Meanwhile, the increase of salt concentration can suppress the electric double layer and decrease the micropore volume, resulting in a decrease in the adsorptive water content. In addition, due to ion hydration, the relaxation of water molecules accelerates, shifting the water distribution curves of soil leftward as concentration increases. This effect overshadows the suppression of electric double layers and the decrease of the micropores, rendering higher adsorptive water content. The microstructure and the pore size distribution, obtained by the scanning electron microscope and mercury intrusion porosimetry experiments, were used to validate the variation of the adsorptive and capillary water in the pores.
资助项目	National Key Research & Development Program of China[2019YFC1509800] ; National Natural Science Foundation of China[41972290] ; National Natural Science Foundation of China[51939011] ; National Natural Science Foundation of China[51639008]
WOS研究方向	Engineering
语种	英语
出版者	ASCE-AMER SOC CIVIL ENGINEERS
WOS记录号	WOS:000672403800016
内容类型	期刊论文
源URL	[http://119.78.100.198/handle/2S6PX9GI/27292]
专题	中科院武汉岩土力学所
通讯作者	Ma, Tiantian
作者单位	1.Shanghai Normal Univ, Sch Civil Engn, Shanghai 201418, Peoples R China 2.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, 2 Xiaohongshan, Wuhan 430071, Hubei, Peoples R China 3.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China 4.Guilin Univ Technol, Coll Civil & Architectural Engn, Guilin 541004, Guangxi, Peoples R China
推荐引用方式 GB/T 7714	Yao, Chuanqin,Wei, Changfu,Ma, Tiantian,et al. Experimental Investigation on the Influence of Thermochemical Effect on the Pore-Water Status in Expansive Soil[J]. INTERNATIONAL JOURNAL OF GEOMECHANICS,2021,21(6):11.
APA	Yao, Chuanqin,Wei, Changfu,Ma, Tiantian,Chen, Pan,&Tian, Huihui.(2021).Experimental Investigation on the Influence of Thermochemical Effect on the Pore-Water Status in Expansive Soil.INTERNATIONAL JOURNAL OF GEOMECHANICS,21(6),11.
MLA	Yao, Chuanqin,et al."Experimental Investigation on the Influence of Thermochemical Effect on the Pore-Water Status in Expansive Soil".INTERNATIONAL JOURNAL OF GEOMECHANICS 21.6(2021):11.