Geometric softening in triaxial tests on granular material

The Paper presents a study of the influence of the deformation mechanism on the softening characteristics of triaxial tests on granular material. The material is treated locally as rigid-plastic with a linear Mohr-Coulomb yield condition. The solutions for the mobilized apparent angle of internal friction are obtained by the approximate method of slices and are expressed in terms of collocational coefficients, defined for an appropriate choice...