Authors: Narsilio, GA; Smith, DW; Mohajeri, A; Pivonka, P Purchase Paper |

Narsilio, GA, Smith, DW, Mohajeri, A & Pivonka, P 2008, 'Numerical Micro-Scale Modelling of Inter-Joint Swelling Pressure', in Y Potvin, J Carter, A Dyskin & R Jeffrey (eds),

Given rock mass joints filled with montmorillonitic clayey soils at various porosities and saturated by a monovalent electrolyte, we investigate the microscale responses of the clayey joints to different background salt concentrations. As analytical solutions are not possible for realistic arrangements of particles within the joints, we employ rather sophisticated micromechanical models based on the solution of the Poisson–Nernst–Planck equations by means of finite element methods, to estimate counter-ion and electrical potential distributions for different particle configurations. We then calculate the disjoining pressures using the van’t Hoff relation and Maxwell stress tensor. As the distance between the clay particles decreases and double-layers overlap, the concentration of counter-ions in the micropores between clay particles increases, pushing apart both faces of the rock joints. Because of this swelling pressure, particles need not contact one another in order to carry ‘effective stress’ throughout the system. This work may lead towards theoretical predictions of the macroscopic deformation of clay-filled rock joints based on the micromechanical modelling of particles found on the interfaces.

Anandarajah, A. (1997) Influence of particle orientation on one-dimensional compression of montmorrillonite, Journal of Colloid and Interface Science, 194, pp. 44–52.

Anandarajah, A. and Chen, J. (1994) Double-layer repulsive force between two inclined platy particles according to the Gouy-Chapman theory, Journal of Colloid and Interface Science, 168, pp. 111–117.

Bolt, G.H. (1956) Physico-chemical analysis of the compressibility of pure clays, Geotechnique, 6, pp. 86–93.

COMSOL–AB (2007) Comsol Multiphysics User's Guide, 588 p.

Cussler, E.L. (1997) Diffusion: mass transfer in fluid systems, Cambridge University Press, xviii, 580 p.

Grodzinsky, A. (2000) Fields, Forces and Flows in Biological Systems, 430 p.

Jahnke, E. and Emde, F. (1945) Tables of functions with formulae and curves = Funktionentafeln mit Formeln und Kurven, Dover, 306 p.

McCormack, D., Carnie, S.L. and Chan, D.Y.C. (1995) Calculations of Electric Double-Layer Force and Interaction Free Energy between Dissimilar Surfaces, Journal of Colloid and Interface Science, 169 (1), pp. 177–196.

Mitchell, J.K. and Soga, K. (2005) Fundamentals of soil behaviour, John Wiley and Sons, xiii, 577 p.

Murad, M.A. and Moyne, C. (2002) Micromechanical computational modeling of expansive porous media, C.R. Mecanique, 330, pp. 865–870.

Phillips, R.J. (1999) Electrostatic forces between particles and planar interfaces, In: Jyh-Ping Hsu (ed.), Interfacial forces and fields: theory and applications, Surfactant science series; Vol. 85. New York, M. Dekker, pp. 251–288.

Santamarina, J.C., Fam, M.A. and Klein, K.A. (2001) Soils and Waves, Wiley, 488 p.

Smith, D., Pivonka, P., Jungnickel, C. and Fityus, S. (2004) Theoretical analysis of anion exclusion and diffusive transport through platy-clay soils, Transport in Porous Media, 57 (3), pp. 251–277.

Sposito, G. (1984) The surface chemistry of soils, Oxford University Press; Clarendon Press, xii, 234 p.

Van Olphen, H. (1977) An introduction to clay colloid chemistry, for clay technologists, geologists, and soil scientists. John Wiley and Sons, xviii, 318 p.

Verwey, E.J.W., Overbeek, J.T.G. and Nes, K.V. (1948) Theory of the stability of lyophobic colloids: the interaction of soil particles having an electric double layer, 205 p.

Weaver, C.E. (1989) Clays, muds, and shales, Elsevier: Distributors for the U.S. and Canada, Elsevier Science Pub., Co., xv, 819 p.

Yongfu, X. (2003) Surface fractal dimension of swelling clay minerals, Fractals 11 (4), pp. 353–362.

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