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Prediction for swelling deformation of fractal-textured bentonite and its sand mixtures in salt solution

Published online by Cambridge University Press:  29 May 2019

Guo-sheng Xiang Open the ORCID record for Guo-sheng Xiang [Opens in a new window] ,
Feng Yu ,
Yong-fu Xu ,
Yuan Fang  and
Sheng-hua Xie
Guo-sheng Xiang*
Affiliation:
Department of Civil Engineering, Anhui University of Technology, Anhui, Maanshan 243002, China Department of Civil Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
Feng Yu
Affiliation:
Department of Civil Engineering, Anhui University of Technology, Anhui, Maanshan 243002, China
Yong-fu Xu
Affiliation:
Department of Civil Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
Yuan Fang
Affiliation:
Department of Civil Engineering, Anhui University of Technology, Anhui, Maanshan 243002, China
Sheng-hua Xie
Affiliation:
Department of Civil Engineering, Anhui University of Technology, Anhui, Maanshan 243002, China
*
*E-mail: [email protected]
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Abstract

Swelling deformation tests of Kunigel bentonite and its sand mixtures were performed in distilled water and NaCl solution. The salinity of NaCl solution has a significant impact on the swelling properties of bentonite, but not on its surface structure. The surface structure was characterized using the fractal dimension Ds. Based on the fractal dimension, a unique curve of the em–pe relationship (em is the void ratio of montmorillonite and pe is the effective stress) at full saturation was introduced to express the swelling deformation of bentonite–sand mixtures. In mixtures with a large bentonite content, the swelling deformation always followed the em–pe relationship. In mixtures with a small bentonite content, when the effective stress reached a threshold, the void ratio of montmorillonite em deviated from the unique em–pe curve due to the appearance of a sand skeleton. The threshold of vertical pressure for mixtures in different solutions and the maximum swelling strains were estimated using the em–pe relationship. The good agreement between estimates and experimental data suggest that the em–pe relationship might be an alternative method for predicting the swelling deformation of bentonite–sand mixtures in salt solution.

Keywords

bentonite–sand mixtureswellingfractalem–pe relationshipeffective stresssalt solution
Type
Article
Information
Clay Minerals , Volume 54 , Issue 2 , June 2019 , pp. 161 - 167
Copyright
Copyright © Mineralogical Society of Great Britain and Ireland 2019 

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Footnotes

Associate Editor: Stephan Kaufhold

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