Résumé en anglais

We study new classes of facets for the cut coneC n generated by the cuts of the complete graph onn vertices. This cone can also be interpreted as the cone of all semi-metrics onn points that are isometricallyl 1-embeddable and, in fact, the study of the facets of the cut polytope is in some sense equivalent to the study of the facets ofC n . These new facets belong to the class of clique-web inequalities which generalize the hypermetric and cycle inequalities as well as the bicycle odd wheel inequalities.