TEMPORARY STRUCTURE FORMATION IN GRANULAR MEDIA UNDER PERIODIC SHEAR: NUMERICAL MODELING AND EXPERIMENT
V. P. Kosykh, O. A. Mikenina
Chinakal Institute of Mining, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia
Keywords: Granular medium, shear, stress diagram, clusters, discrete elements, long periods, time-varying response
Abstract
The authors implemented a series of lab-scale cyclic shear deformation tests of granular medium. The steady-state boundary conditions kept for the hundreds of thousands shear cycles result in the time-varying response of the test medium. The periods of stress fluctuations of the order of tens, hundreds and thousands cycles are observed in the medium. The time-varying response of the medium is connected with periodic formation and deformation of clusters and force chains in the medium. The DEM-based numerical modeling of cyclic shear of a granular medium with the same loading program as in the tests shows the adequacy of the discrete element method and the agreement of the numerical and experimental data.
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