International audienceA porous medium, which matrix is a perfectly plastic solid, is considered. This paper proposes a method to determine the macroscopic admissible stress states. The method is based on a homogenization technique which takes advantage of the equivalence, under certain conditions, between a problem of limit analysis and a ficticious nonlinear elastic problem. The particular case of a Drucker–Prager solid matrix is considered. The method provides an analytical expression for the complete macroscopic strength criterion.On propose une méthode de détermination des états de contrainte situés sur la frontière du domaine des contraintes macroscopiques admissibles pour un milieu poreux à matrice solide parfaitement plastique. On ut...