SURFACE FRACTAL DIMENSION OF BENTONITE AND ITS APPLICATION IN CALCULATION OF SWELLING DEFORMATION

G. S. Xiang, Y. F. Xu () and H. Jiang
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G. S. Xiang: School of Naval Architecture and Civil Engineering, Shanghai Jiaotong University, Shanghai 200240, P. R. China
Y. F. Xu: School of Naval Architecture and Civil Engineering, Shanghai Jiaotong University, Shanghai 200240, P. R. China
H. Jiang: School of Naval Architecture and Civil Engineering, Shanghai Jiaotong University, Shanghai 200240, P. R. China

Surface Review and Letters (SRL), 2014, vol. 21, issue 05, 1-12

Abstract: The correlation between the void ratio of swelled montmorillonite and the vertical overburden pressure can be expressed as${e}_{{\rm m}} = Kp_{{\rm s}}^{{D}_{{\rm s}}-3}$. The surface fractal dimensionDsof five bentonites were estimated from the swelling deformation tests according to this fractal correlation. The reliability of surface fractal dimension obtained from the swelling deformation test was confirmed by nitrogen adsorption test, with identical values of surface fractal dimension obtained from both tests. The surface fractal dimension can also be used to estimate the swelling deformation of bentonite, after calculating the swelling coefficientKfrom the parameters of diffuse double layer (DDL) model in the osmotic swelling phase. Comparison of the model predictions with a number of experimental results on swelling deformation of bothNadominant andCadominant bentonites suggests that the surface fractal model works excellent in the cases tested.

Keywords: Bentonite; surface fractal dimension; swelling deformation; nitrogen adsorption; DDL method; FHH equation; Neimark model (search for similar items in EconPapers)
Date: 2014
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DOI: 10.1142/S0218625X14500747

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