Unsaturated hydro-mechanical-chemo coupled constitutive model with consideration of osmotic flow

Xiaohui Chen, Michael A. Hicks

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

Since low permeability rock has the potential to behave as an actual semi-permeable osmotic membrane, chemical osmosis may have an effect on water flow and needs to be accounted for in analysis. Hence, an advanced fully coupled formulation for modelling unsaturated hydro, chemical and mechanical effects is here presented based on modified mixture theory. Firstly, the classical Darcy’s law has been modified to include the chemical potential. Secondly, the mechanical deformation, which affects the permeability, has been coupled with the water and chemical flows by using Helmholtz free energy and the Gibbs–Duhem equation. Finally, an illustrative numerical example with relevance to radioactive waste disposal has been analysed to investigate the performance of the coupled formulation and the relative influence of parameters.
Original languageEnglish
Pages (from-to)94-103
Number of pages10
JournalComputers and Geotechnics
Volume54
Early online date30 Jul 2013
DOIs
Publication statusPublished - Oct 2013
Externally publishedYes

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Constitutive models
Radioactive waste disposal
Osmosis
Chemical potential
permeability
Free energy
Water
osmosis
Rocks
waste disposal
radioactive waste
Membranes
water flow
membrane
chemical
rock
modeling
energy
water
effect

Cite this

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Unsaturated hydro-mechanical-chemo coupled constitutive model with consideration of osmotic flow. / Chen, Xiaohui; Hicks, Michael A.

In: Computers and Geotechnics, Vol. 54, 10.2013, p. 94-103.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Unsaturated hydro-mechanical-chemo coupled constitutive model with consideration of osmotic flow

AU - Chen, Xiaohui

AU - Hicks, Michael A.

PY - 2013/10

Y1 - 2013/10

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AB - Since low permeability rock has the potential to behave as an actual semi-permeable osmotic membrane, chemical osmosis may have an effect on water flow and needs to be accounted for in analysis. Hence, an advanced fully coupled formulation for modelling unsaturated hydro, chemical and mechanical effects is here presented based on modified mixture theory. Firstly, the classical Darcy’s law has been modified to include the chemical potential. Secondly, the mechanical deformation, which affects the permeability, has been coupled with the water and chemical flows by using Helmholtz free energy and the Gibbs–Duhem equation. Finally, an illustrative numerical example with relevance to radioactive waste disposal has been analysed to investigate the performance of the coupled formulation and the relative influence of parameters.

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DO - 10.1016/j.compgeo.2013.06.001

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