Discussion: On the applicability of cross-anisotropic elasticity to granular materials at very small strains

R. KUWANO and R. J. JARDINE (2002).Ge´otechnique52, No. 10, 727–749M. Arroyo, Iberinsa, Madrid, SpainD. Muir Wood, University of Bristol, UKThis work offers an impressive set of data on the anisotropiccharacteristics of small-strain stiffness of granular materials.The trends revealed by the paper are, overall, coherent withother data on anisotropic soil stiffness (Arroyo & MuirWood, 2003). This discussion focuses on one admittedlyminor but nevertheless intriguing result included in thepaper: the observed differences between S