Article | REF: C301 V1

Water in unsaturated soils

Authors: Pierre DELAGE, Yu-Jun CUI

Publication date: November 10, 2000, Review date: July 20, 2020

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1. Soil suction

1.1 Capillarity

Capillarity phenomena occur at the interface between two fluids, because molecules there are subject to a set of unbalanced interaction forces, unlike a molecule located within the fluid. A water molecule within a body of water is subject to actions of the same nature (figure 1 b ), whereas one at the interface between two fluids, water-air for example, is subject to different actions: actions due to water and actions due to air (figure 1 a ). Water molecules at the water-air interface are therefore attracted to the water mass, and the water surface is subjected to a force perpendicular...

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Soil suction