a Laboratoire de Géologie-Pétrologie, 38 Rue des Trente-six Ponts, 31078, Toulouse Cedex, France
b Laboratoire d'Optique Electronique du C.N.R.S. 29 Rue Jeanne Marvig B.P. 4347, 31055, Toulouse Cedex, France
Abstract:
This paper comments about the use of phenomenological relations between stress and strain parameters in the field of natural deformation of rocks. Three criteria are proposed in order to ensure the validity of such an approach.