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Modelling of compacted bentonite swelling accounting for salinity effects
https://orcid.org/0000-0001-6629-9293
https://orcid.org/0000-0003-3129-4008
https://orcid.org/0000-0002-9607-6100
https://orcid.org/0000-0003-4223-3083
https://orcid.org/0000-0001-7080-0765
AbstractThis paper presents a formulation to incorporate the influence of water salinity on the swelling behaviour of a MX-80 bentonite into previously developed hydro-mechanical models that can reproduce swelling under dilute conditions. The effects of salinity on macro- and microstructural water chemical potentials were introduced. In addition, a description of solute transport was included to characterise the evolution of the system's salinity. A simplified geochemical model was adopted to idealise the geochemical complexity of bentonite. In addition, the modelling of the destructuration process that occurs during swelling was modified to account for the effect of salinity. The formulation was implemented in a multiphysics partial differential equation finite element solver, and the numerical model was used to simulate several vertical free swelling tests with feed water of different salt contents (deionised, 10, 35 and 70g/L). The results demonstrate that even though the model can be developed further, it represents a significant improvement over models that do not account for the effects of salinity.
HighlightsInfluence of water salinity on the swelling behaviour of a MX-80 bentoniteSimplification of the bentonite geochemical complexityMacro- and microstructural water equilibrium (equal chemical potentials)Improvement over models that do not account for the effects of salinity
Modelling of compacted bentonite swelling accounting for salinity effects
https://orcid.org/0000-0001-6629-9293
https://orcid.org/0000-0003-3129-4008
https://orcid.org/0000-0002-9607-6100
https://orcid.org/0000-0003-4223-3083
https://orcid.org/0000-0001-7080-0765
AbstractThis paper presents a formulation to incorporate the influence of water salinity on the swelling behaviour of a MX-80 bentonite into previously developed hydro-mechanical models that can reproduce swelling under dilute conditions. The effects of salinity on macro- and microstructural water chemical potentials were introduced. In addition, a description of solute transport was included to characterise the evolution of the system's salinity. A simplified geochemical model was adopted to idealise the geochemical complexity of bentonite. In addition, the modelling of the destructuration process that occurs during swelling was modified to account for the effect of salinity. The formulation was implemented in a multiphysics partial differential equation finite element solver, and the numerical model was used to simulate several vertical free swelling tests with feed water of different salt contents (deionised, 10, 35 and 70g/L). The results demonstrate that even though the model can be developed further, it represents a significant improvement over models that do not account for the effects of salinity.
HighlightsInfluence of water salinity on the swelling behaviour of a MX-80 bentoniteSimplification of the bentonite geochemical complexityMacro- and microstructural water equilibrium (equal chemical potentials)Improvement over models that do not account for the effects of salinity
Modelling of compacted bentonite swelling accounting for salinity effects
https://orcid.org/0000-0001-6629-9293
https://orcid.org/0000-0003-3129-4008
https://orcid.org/0000-0002-9607-6100
https://orcid.org/0000-0003-4223-3083
https://orcid.org/0000-0001-7080-0765
AbstractThis paper presents a formulation to incorporate the influence of water salinity on the swelling behaviour of a MX-80 bentonite into previously developed hydro-mechanical models that can reproduce swelling under dilute conditions. The effects of salinity on macro- and microstructural water chemical potentials were introduced. In addition, a description of solute transport was included to characterise the evolution of the system's salinity. A simplified geochemical model was adopted to idealise the geochemical complexity of bentonite. In addition, the modelling of the destructuration process that occurs during swelling was modified to account for the effect of salinity. The formulation was implemented in a multiphysics partial differential equation finite element solver, and the numerical model was used to simulate several vertical free swelling tests with feed water of different salt contents (deionised, 10, 35 and 70g/L). The results demonstrate that even though the model can be developed further, it represents a significant improvement over models that do not account for the effects of salinity.
HighlightsInfluence of water salinity on the swelling behaviour of a MX-80 bentoniteSimplification of the bentonite geochemical complexityMacro- and microstructural water equilibrium (equal chemical potentials)Improvement over models that do not account for the effects of salinity
Modelling of compacted bentonite swelling accounting for salinity effects
Navarro, Vicente (author) / Yustres, Ángel (author) / Asensio, Laura (author) / la Morena, Gema De (author) / González-Arteaga, Jesús (author) / Laurila, Teemu (author) / Pintado, Xavier (author)
Engineering Geology ; 223 ; 48-58
2017-04-09
11 pages
Article (Journal)
Electronic Resource
English
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