Abstract: It is proposed a simple non linear
incremental modelling of the compression of granular materials and powders. It
describes the main features of undrained compression and of oedometric
compression using the results of compression tests at constant s2=s3 . It generalises the concept of characteristic
state. It shows that trajectories arriving at a given critical state shall
pertain to a single surface in the (v,q,p) space, which confirms the recent
result demonstrating that Hvorslev's and Roscoe's surfaces are part of the same
surface. Effects of induced anisotropy are discussed; comparison with classical
camclay model is performed.
poudres & grains 9, 1-12 (15 novembre 1999)