Numerical Analysis of Plastic Behavior of Granular Media Exposed to Deformation under Broken Trajectory Loading
S. V. KLISHIN, A. F. REVUZHENKO
Chinakal Institute of Mining, Siberian Branch, Russian Academy of Sciences, Krasnyi pr. 54, Novosibirsk, 630091 Russia
Keywords: континуальная модель, сплошная среда, гранулированный материал, напряженное состояние, дилатансия, метод дискретных элементов, численный анализ, continuum model, continuum medium, granular material, stress state, dilatancy, discrete element method, numerical analysis
Abstract
Based on DEM, the problem on uniform shearing of granular material specimen is considered, the shape of the particles was chosen to be spherical, with assigned distribution per radii. At interfaces of the particles, dry friction and viscosity were taken into account. Loading was implemented as simple and broken trajectory shearing. The load trajectory was broken by means of sudden change in the shearing direction. It has been found that in this case, dilatancy rate and angle between axes of stress tensors and strain rates change jump-wise. The discrete medium shows the properties of the continuum model of granular material with internal friction and dilatancy. The authors discuss a criterion of the continuum model to be equivalent to the initial discrete model. Applicability of the numerical results to the continuum modeling of deformation is demonstrated.
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