| http://www.w3.org/ns/prov#value | - He realized that in a soft soil, such as clay, thedeformations are caused by the effective stresses, definedas the difference of the total stress and the pore pressure,where the latter must be considered to act over the entiresurface of a cross section.The theory was generalized to three dimensions and moregeneral materials, including porous rock, by Biot (1941),and since then it has been applied
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