Physicochemical approach to evaluating the swelling pressure of soils

doi:10.1016/j.clay.2019.02.011

CORC > 武汉岩土力学研究所 > 中科院武汉岩土力学所 > 岩土力学所知识全产出 > 期刊论文

	Physicochemical approach to evaluating the swelling pressure of soils
	Ma, Tiantian ; Yao, Chuanqin ; Dong, Yi ; Yi, Panpan ; Wei, Changfu
刊名	APPLIED CLAY SCIENCE
	2019
卷号	172 期号:-页码:85-95
关键词	Swelling pressure Salt solutions Intergranular pressure Donnan osmotic pressure Small-strain shear modulus
ISSN号	0169-1317
DOI	10.1016/j.clay.2019.02.011
英文摘要	Swelling pressure is an important parameter for understanding the expansive nature of the bentonites and natural clayey soils. During the wetting process, the intergranular stresses evolve due to the capillarity and adsorption of clay minerals, and swelling pressure is developed if soil deformation is constrained by the boundary conditions. Strong physicochemical interactions between clay particles and water molecules prevail in the development of intergranular stresses in expansive soils. In this paper, an empirical approach considering Dorman's osmotic effect was proposed to calculate the change in swelling pressure of expansive soils infiltrated by salt solutions with different concentrations. In the model, the intergranular stress addresses the physicochemical interactions between the minerals of clay and saturating fluids with ion concentration gradients induced by fixed negative surface charges. The differential volumetric strain assuming nonlinear elasticity identifies two mechanisms for the variation of the swelling pressure with the concentration of salt solution. The Donnan osmotic pressure decreases as the concentration increases, and the bulk modulus decreases as the concentration increases. The experimental results show that the variation of the Donnan osmotic pressure dominants the evolution of the swelling pressure with the salt solution concentration for a given soil. The comparison between the simulations and the available experimental data in the literature illustrates well the prediction of the swelling pressure of expansive soils by using the proposed model.
WOS研究方向	Chemistry ; Materials Science ; Mineralogy
语种	英语
WOS记录号	WOS:000462803500011
内容类型	期刊论文
源URL	[http://119.78.100.198/handle/2S6PX9GI/14991]
专题	岩土力学所知识全产出_期刊论文
作者单位	1.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Hubei, Peoples R China; 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China; 3.Wuchang Univ Technol, Wuhan 430223, Hubei, 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	Ma, Tiantian,Yao, Chuanqin,Dong, Yi,et al. Physicochemical approach to evaluating the swelling pressure of soils[J]. APPLIED CLAY SCIENCE,2019,172(-):85-95.
APA	Ma, Tiantian,Yao, Chuanqin,Dong, Yi,Yi, Panpan,&Wei, Changfu.(2019).Physicochemical approach to evaluating the swelling pressure of soils.APPLIED CLAY SCIENCE,172(-),85-95.
MLA	Ma, Tiantian,et al."Physicochemical approach to evaluating the swelling pressure of soils".APPLIED CLAY SCIENCE 172.-(2019):85-95.