Abstract
Numerical simulations of tri-axial compression tests are performed in order to investigate the effectiveness of Material Point Method for large deformation geotechnical problems. Mohr-Coulomb constitutive model is adopted as a geotechnical nonlinearity, of which parameters are obtained by an experimental results. The stress-strain relationship obtained by simulations shows a good agreement with that by the experiments at the large strain level, showing the effectiveness of MPM.
Parameter studies are also performed in order to investigate factors that influence on the relationship between initial shear bands and final shear bands, which are observed during simulations of tri-axial compression tests. Then, followings are obtained as the main findings of this study. (1) Initial shear bands are generated near the constrained edges of specimen; (2) When both top and bottom edges of specimen are constrained, initial shear bands near the edges, at which external forces are applied, finally form clear shear bands; (3) A geometry of specimen gives great influence on the formations of shear band when rectangular specimens are used.
