Description: Dilatant geornaterials, i.e. fissured rocks, dense sands, stiff clays, increase the porosity when subjected
to sufficiently high deviatoric stresses. If these materials are saturated with a pore fluid and the pore
volume increases more rapidly than the fluid can flow into it, the pore pressure decreases, This means
an increase in effective compressive stress which inhibits further inelastic deformation up to a certain
limit. The phenomenon is called dilatant hardening or strengthening and was first discussed by
Reynolds in 1885 in his studies on granular material
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