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Yield design formulation for porous media subjected to flow, usingapproximate pressure field. We attempt here to use the kinematic method ofyield design in the case of a porous medium subjected to flow (with or withoutfree surface), without looking for the exact solution of the pressure field.The method proposed here is based on the use of approximate pressure fields. Inthis paper, we show how, under different conditions concerning the yieldcriterion and the velocity field, the use of such approximate fields allows toobtain a necessary condition for stability without having to find the realpressure field. Nous cherchons ici \`a utiliser la m\'ethode cin\'ematique ducalcul \`a la rupture dans le cas d'un milieu poreux soumis \`a un \'ecoulementavec ou sans surface libre sans conna\^itre la solution exacte du champ depression. La m\'ethode propos\'ee ici repose sur l'utilisation de champs depression approch\'es par d\'efaut. Nous montrerons comment sous certainesconditions portant sur le crit\`ere de r\'esistance et sur le champ de vitesseutilis\'e, l'utilisation de tels champs de pression approch\'es permetd'obtenir une condition n\'ecessaire de stabilit\'e sans avoir \`a d\'eterminerexactement l'\'ecoulement.

comptes rendus mécanique

Yield design formulation for porous media subjected to flow, using  approximate pressure field. Calcul \`a la rupture en pr\'esence d'un  \'ecoulement : formulation cin\'ematique avec un champ de pression approch\'e