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Unsaturated hydro-mechanical-chemical constitutive coupled model based on mixture coupling theory: Hydration swelling and chemical osmosis

Chen, X. and Pao, W. and Thornton, S. and Small, J. (2016) Unsaturated hydro-mechanical-chemical constitutive coupled model based on mixture coupling theory: Hydration swelling and chemical osmosis. International Journal of Engineering Science, 104 . pp. 97-109.

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Official URL: https://www.scopus.com/inward/record.uri?eid=2-s2....

Abstract

Very low permeability soils and rocks may act as actual semi-permeable membranes and also have the potential to swell if they contain smectite clay minerals. This study extends mixture coupling theory for unsaturated, very low permeability swelling rock, based on non-equilibrium dynamics and Biot's elasticity, and develops new advanced coupled mathematical formulations, by including unsaturated chemical osmosis and hydration swelling. Helmholtz free energy has been used to derive the link between solid deformation and multiphase transport. Darcy's law has been extended and the influence of swelling on stress and strain has been included. The mathematical formulation shows that swelling capacity may have a strong influence on the deformation of host rocks (e.g. for nuclear waste disposal) in the chemical osmosis process, which is demonstrated by a numerical simulation of two representative cases. Important engineering applications of this model and analysis are highlighted. © 2016 Elsevier Ltd. All rights reserved.

Item Type:Article
Impact Factor:cited By 13
Uncontrolled Keywords:Deformation; Flow of fluids; Free energy; Mixtures; Osmosis; Radioactive waste disposal; Radioactive wastes; Swelling; Thermodynamics; Waste disposal, Biot's theory; Coupling theory; Non equilibrium thermodynamics; Osmotic flow; Unsaturated, Hydration
ID Code:25642
Deposited By: Ms Sharifah Fahimah Saiyed Yeop
Deposited On:27 Aug 2021 09:39
Last Modified:27 Aug 2021 09:39

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