Comprehensive DEM Study of the Effects of Rolling Resistance On Strain Localization in Granular Materials
This paper presents the results of a comprehensive study of the effects of rolling resistance in shear band formation in granular material using DEM (Discrete Element Modeling). The study used the two-dimensional Particle Flow Code (PFC) to simulate biaxial compression and simple shear tests in granular materials. A rolling resistance model was implemented as a user-defined model (UDM) in PFC. A series of parametric studies were performed to investigate the effects of different levels of rolling resistance parameters on the emergence and shear bands in granular materials. The results reinforce prior conclusions by Oda et al. (Mech. Mater. 1:269–283, 1982) on the importance of rolling resistance in promoting shear band formation in granular materials. It was shown that increased rolling resistance results in the development of columns of particles in granular soils during the strain hardening process. The buckling of these columns of particles then leads to the development of shear bands. It is concluded that the variation of rolling resistance parameters has a significant effect on the orientation, thickness and the onset of occurrence of shear bands. The PFC models were tested under a wide range of macro-mechanical parameters and boundary conditions, and how they influence shear band characteristics.
KeywordsDiscrete element modeling Granular materials Rolling résistance Strain localization Shear banding
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