Volume change and swelling pressure of expansive clay in the crystalline swelling regime

Wayllace, Alexandra

doi:10.32469/10355/7110

Cited by 5 publications

(29 citation statements)

References 23 publications

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“…Osmotic hydration therefore results from concentration differences of these dissolved ions within diffuse layer and the free bulk water within the pore [20]. Osmotic hydration is a long-range interaction, which mostly depends on ionic concentration, the type of exchangeable ions, pH of the pore water, and more importantly the clay mineralogy [17,20]. The osmotic hydration usually occurs by the adsorption of successive water layers at basal spacing larger than 22 Å and consequent development of double layer as saturation increases [16].…”

Section: Physico-chemical Behaviour Of Shalesmentioning

confidence: 99%

“…In addition, osmotic H/DH can also take place in non-smectite clays to some extent, especially if nano-pores present [13] which in turn can contribute to water adsorption [17]. The water adsorption into samples with low moisture content is associated with both surface and osmotic hydrations however the surface hydration is the dominant process in the initial stage of water uptake [20].…”

Section: Physico-chemical Behaviour Of Shalesmentioning

confidence: 99%

“…Surface hydration results from the adsorption of molecular layers of water on the basal crystal surfaces and interlayer spacing of 10-22 Å [16][17][18][19]. This process is driven primarily by the energy associated with the hydration of exchangeable cations and attraction associated with solid-liquid interactions (hydrogen bonding, charged surface-dipole attraction, or a combination of both) occurring in the immediate vicinity of the clay particle surfaces [17,20]. Therefore, surface hydration takes place if no or low moisture content presents on the surface or interlayer spacing of the minerals.…”

Section: Physico-chemical Behaviour Of Shalesmentioning

confidence: 99%

Section: Physico-chemical Behaviour Of Shalesmentioning

confidence: 99%

See 3 more Smart Citations

Mechanisms of water adsorption into partially saturated fractured shales: An experimental study

Roshan

Ehsani²,

Marjo

et al. 2015

Fuel

148

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Section: Physico-chemical Behaviour Of Shalesmentioning

confidence: 99%

Section: Physico-chemical Behaviour Of Shalesmentioning

confidence: 99%

Section: Physico-chemical Behaviour Of Shalesmentioning

confidence: 99%

Section: Physico-chemical Behaviour Of Shalesmentioning

confidence: 99%

See 2 more Smart Citations

Mechanisms of water adsorption into partially saturated fractured shales: An experimental study

Roshan

Ehsani²,

Marjo

et al. 2015

Fuel

148

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“…The structure of the rock is formed by the stacks of clay minerals (each stack is made of several silica layers). The space between these silica layers forms the interlayer space (or interlayer pores) while the space formed by the fabric of the rock through the orientation of individual mineral stacks form the outer‐layer pores [ Wayllace , ].…”

Section: Introductionmentioning

confidence: 99%

Investigation of the kinetics of water uptake into partially saturated shales

Roshan

Andersen

Rutlidge

et al. 2016

Water Resources Research

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Several processes have been proposed to describe the low recovery of hydraulic fracturing fluid in unconventional shale reservoirs which has caused both technical and environmental concerns. This study describes novel hydraulic experiments to quantitatively investigate the kinetics of water uptake into partially saturated shale through investigating the pressure response of injecting fluids (NaCl, KCl, MgCl2, and CaCl2 with different ionic concentrations) into crushed and sieved shale fragments. The results of the study indicate that the cumulative water uptake under pressure is likely to be controlled by three processes: surface hydration, capillary hydration including advective flow, and osmotic hydration. Each of these processes is a function of the differences between the in situ pore fluid and the injection fluid (solution chemistry and concentration) and the shale physicochemical properties, in particular the contact surface area, pore diameter, and the Cation Exchange Capacity (CEC). The uptake is not instantaneous, but is diffusion limited, with the rate governed by a number of kinetic processes. Uptake proceeds in three stages, each associated with a different process: (1) predominantly surface hydration, (2) predominantly capillary hydration and finally, (3) predominantly osmotic hydration. It was also shown that shale can take up a significant amount of water compared to its available solid volume. However, contrary to the conventional understanding, the increase in salinity of the injection fluid does not necessarily lead to reduced water uptake into shales, but is dependent on the type and concentration of cations within the shale and injecting fluid.

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Micromechanical approach to swelling behavior of capillary‐porous media with coupled physics

Eghbalian

Pouragha

Wan

2018

Num Anal Meth Geomechanics

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Summary A detailed multiscale analysis is presented of the swelling phenomenon in unsaturated clay‐rich materials in the linear regime through homogenization. Herein, the structural complexity of the material is formulated as a three‐scale, triple porosity medium within which microstructural information is transmitted across the various scales, leading ultimately to an enriched stress‐deformation relation at the macroscopic scale. As a side note, such derived relationship leads to a tensorial stress partitioning that is reminiscent of a Terzaghi‐like effective stress measure. Otherwise, a major result that stands out from previous works is the explicit expression of swelling stress and capillary stress in terms of micromechanical interactions at the very fine scale down to the clay platelet level, along with capillary stress emerging due to interactions between fluid phases at the different scales, including surface tension, pore size, and morphology. More importantly, the swelling stress is correlated with the disjoining forces due to electrochemical effects of charged ions on clay minerals and van der Waals forces at the nanoscale. The resulting analytical expressions also elucidate the role of the various physics in the deformational behavior of clayey material. Finally, the capability of the proposed formulation in capturing salient behaviors of unsaturated expansive clays is illustrated through some numerical examples.

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Volume change and swelling pressure of expansive clay in the crystalline swelling regime

Cited by 5 publications

References 23 publications

Mechanisms of water adsorption into partially saturated fractured shales: An experimental study

Mechanisms of water adsorption into partially saturated fractured shales: An experimental study

Investigation of the kinetics of water uptake into partially saturated shales

Micromechanical approach to swelling behavior of capillary‐porous media with coupled physics

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