DEM-Based Modeling of Shear Localization and Transition of Geomedium to Unstable Deformation
D. S. Zhurkina1, S. V. Klishin1, S. V. Lavrikov1, M. G. Leonov2
1Chinakal Institute of Mining, Siberian Branch, Russian Academy of Sciences, Novosibirsk, 630091 Russia
2Geological Institute, Russian Academy of Sciences, Moscow, 119017 Russia
Keywords: Discrete Element Method, packing, shear, numerical modeling, elastic limit, strength, instability, strain localization
Abstract
The authors develop the DEM-based procedure for the numerical testing of granular samples under non-uniform compression with different load programs. The algorithm of initial packings of particles is proposed. The calculations are performed for different methods of loading with suppressed dilatancy and with dilatancy-generated volume. The macro characteristics of the stress-strain behavior of the test samples are related with the micro properties of discrete particles. The post-critical shearing induces the unstable behavior with localizations of shears, and a descending branch appears in the load diagram. The application ranges of the developed method for the mathematical modeling of shear localization are defined.
|
