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Book Sections Year : 2015

Semipermeable Membrane Properties and Chemo-mechanical Coupling in Clay Barriers

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Abstract

In this chapter, the semipermeable behavior of clay-rocks is mainly exemplified on fluid flow. For such media and besides pressure gradients, other driving forces not accounted for in the classical form of Darcy's law describes fluid flow. In the context of coupled transport processes, the additional driving forces are chemical, electrical potential and thermal gradients. Consequently, the resulting so-called osmotic fluxes must be considered in clay media for hydrodynamic and transport calculations. All available osmotic conductivity data have been collected here, including the most recent values acquired in the course of ongoing research on nuclear waste confinement in clay-rock formations. By means of adjusted curves, these data can be directly used as abacuses. The data are also used to support some theoretical calculations, some of which are presented and discussed here. These predictive models (theoretical expressions or abacuses) for osmotic parameters make it possible to perform some fluid and transport calculations within clay-rock formations. Therefore, they can be conveniently used for pore pressure profiles interpretation within clay stratigraphic layer, calculation of characteristic times of solute migration through Peclet number characterization, or even steady or transient state direct transport calculations. For transient state hydrodynamics, the identification of the required chemomechanical coupling coefficient is analyzed in the light of the most recent theoretical work.
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Dates and versions

hal-01256691 , version 1 (15-01-2016)

Identifiers

  • HAL Id : hal-01256691 , version 1

Cite

Julio Goncalves, Pierre Marie Adler, Philippe Cosenza, Aliaksei Pazdniakou, Ghislain De Marsily. Semipermeable Membrane Properties and Chemo-mechanical Coupling in Clay Barriers. Natural and Engineered Clay Barriers, pp.269-327, 2015, Natural and Engineered Clay Barriers. ⟨hal-01256691⟩
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