Desiccation shrinkage of non-clayey soils: a numerical study

A meso-scale model based on the evolution of the pore system and idealized as bimodal is numerically examined. A simplified evolution of the model reveals a series of characteristics that qualitatively agree with the observed macroscopic experimental findings. The principal mechanism is deemed to be driven by the surface evaporation and water outflow generating a pore pressure gradient resulting in the shrinkage mainly of the largest pores. The amount of shrinkage is a function of (negative) pore pressure and is controlled by the compressibility of the solid matrix. The numerical model includes also the ensuing partial saturation stage initiated by the air entry simulated as a scenario with a moving phase interface inside the pore. The proposed model can be extended beyond the two-mode porosity soils, to include the multi-modal porosity, or its statistical representation.


Published in:
International Journal for Numerical and Analytical Methods in Geomechanics, 37, 1782–1800
Year:
2013
Publisher:
Hoboken, Wiley-Blackwell
ISSN:
0363-9061
Keywords:
Laboratories:


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 Record created 2012-04-27, last modified 2018-03-17

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