Abstract
The capillary effect in polydisperse porous systems of soils and sediments is discussed. Its quantitative assessment is based on a physically–based model of capillary rise, depending on the parameters of the dispersivity of soil particles, the soil bulk density and the density of its solid phase, wettability and the amount of strongly bounded water. In contrast to the well–known Jurin’s law, the model takes into account polydispersity and variation in pore size under the influence of the soil bulk density. The model adequately predicts the height of capillary rise both in artificial monodisperse porous systems (granulometric fractions) and in real soils with particles of different sizes from 0.006 to 1 mm. It can be used to calculate the effect of capillarity in soils and intelligent soil design with capillary barriers.
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