Role of osmotic suction in volume change of clays in salt solution

Xu, Yongfu; Xiang, Guosheng; Jiang, Hao; Chen, Tao; Chu, Feifei

doi:10.1016/j.clay.2014.09.006

Cited by 71 publications

(36 citation statements)

References 25 publications

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“…However, an evaluation of such stresses is not likely. Recently, Xu et al (2014) proposed a new formulation for effective stresses, accounting for fractal dimension of the clay particles. They showed a unique relation between the void ratio and such parameter, also for the Ponza bentonite, which is independent of the pore fluid concentration.…”

Section: Discussionmentioning

confidence: 99%

Shear displacements induced by decrease in pore solution concentration on a pre-existing slip surface

Maio

Scaringi

2016

Engineering Geology

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Section: Discussionmentioning

confidence: 99%

Shear displacements induced by decrease in pore solution concentration on a pre-existing slip surface

Maio

Scaringi

2016

Engineering Geology

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“…In order to embody the effect of the osmotic suction, an osmotic stress component is added to the effective stress. The effective stress is proposed to represent the total net vertical stress experienced by compacted bentonite and has the following form (Xu et al, 2014):…”

Section: Impact Of Solutionmentioning

confidence: 99%

Experimental study of the effect on one-dimension erosion of compacted bentonite

2019

JGS Special Publication

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Bentonite swells after absorbing water and forms colloids that can release gel particles into solution causing the erosion of bentonite particle. The process of colloidal erosion can be described by the free expansion of bentonite. A new designed one-dimensional free swelling tests is performed to simulate one dimension erosion of compacted bentonite. Compacted specimens are made into two initial dry densities and water contents. De-ionized water and NaCl, Na 2 SO 4 , CaCl 2 solutions with concentrations of 0.1, 0.5, 1.0 and 2.0 mol/L were used to soak the specimens. The effects of initial dry density, initial water content and saline solution on the free swelling behavior of compacted commercial bentonite are analyzed. Results show that, the final total swelling deformation is almost independent of initial water content, but increases with the initial dry density and decreases with the increase in osmotic suction of the infiltration solution.

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“…In comparison, saturation of bentonite specimens with inflowing salt solutions increases the osmotic suction in pore water, which in turn acts as an additional effective stress component (Rao & Thyagaraj, 2007). Based on the surface structure of montmorillonite aggregates and montmorillonite layers, Xu et al (2014) proposed a new formula for effective stress, incorporating the osmotic suction of pore fluid, which may be expressed as:…”

Section: Swelling Deformation Testsmentioning

confidence: 99%

“…In bentonite swelling, the surface fractal dimension increases with increasing swelling strain (Xu et al, 2003). The correlation of the void ratio of montmorillonite with effective stress is given by (Xu et al, 2014):…”

Section: Swelling Deformation Testsmentioning

confidence: 99%

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

Xiang

et al. 2019

Clay miner.

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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.

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Role of osmotic suction in volume change of clays in salt solution

Cited by 71 publications

References 25 publications

Shear displacements induced by decrease in pore solution concentration on a pre-existing slip surface

Shear displacements induced by decrease in pore solution concentration on a pre-existing slip surface

Experimental study of the effect on one-dimension erosion of compacted bentonite

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

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