Abstract
Large-scale drained triaxial compression tests have been carried out on heavily compacted samples of different types of rockfill over a range of confining pressures. The Mohr failure envelopes show pronounced curvature, particularly at low stresses. An assessment has been made of the significance of this for the stability of rockfill slopes where generally the shear strength of the rockfill at low stresses is of major importance. It is concluded that in many instances rockfill embankments could be built with slopes much steeper than those currently adopted and still have an adequate factor of safety against stability failure. Des essais de compression triaxiale drainés à grande échelle ont été réalisés sur des échantillons fortement compactés de différents types de remblai rocheux, suivant toute une gamme de pressions d'éntreinte latérale. Les courbes limites de Mohr présentent une courbure prononcée, notamment aux faibles contraintes. On etabli la signification de ce résultat vis-à- vis de la stabilité des talus de remblai rocheux dont la résistance au cisaillement pour de faibles contraintes est généralement predominante. On en a conclu que, dans bien des cas, il était possible de construire des talus de remblai rocheux avec une pente beaucoup plus raide que celle des talus couramment construits, le coefficient de sécurité relatif au glissement restant adequat.
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