This study explores several aspects of the 'discontinuous' approach to prediction of settlements of foundations on jointed rock. The first part presents the results of experiments with numerical and analytical solutions. It is shown that solutions of continuum elasticity cannot be used without introducing errors due to method alone, which could be serious for sensitive structures.The second part of the study describes measurements ofjoint stiffness on samples of natural joints in limestone and sandstone. Normal and shear stiffness coefficients were measured. It was found that the unit shear stiffness coefficient varies greatly with displacement, and an empirical relationship was derived that might be useful in analysing other rocks.Cette etude examine plusieurs aspects de la prediction par modele "discret" de tassements de fondations sur du roc jointe. La premiere partie presente les resultats d'essais de solutions numiriques et analytiques. 11 est demontre que les solutions basees sur I'elasticitC des milieux continus ne peuvent pas etre utilisees sans introduire des erreurs dues B la methodeelle-mime et qui pourraient avoir des effets nefastes pour les structures sensibles aux deformations.La seconde partie de I'Ctude presente des mesures de rigidite desjoints qui ont Cte faites surdes echantillons de joints naturels dans du calcaire et du gres. Des coefficients de rigidite en compression et en cisaillement ont ete mesures. I1 a ete trouve que le coefficient de rigidit6 en cisaillement varie considCrabiement avec ledeplacement; une relation empirique qui pourrait itre utile dans I'analyse d'autres roches aCtC mise au ooint.
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