Jamming transition of a granular pile below the angle of repose

Abstract

We study experimentally the relaxation towards mechanical equilibrium of a granular pile which has just experienced an avalanche and discuss it in the more general context of the granular jamming transition. Two coexisting dynamics are observed in the surface layer: a short time exponential decay consisting in rapid and independent moves of grains and intermittent bursts consisting in spatially correlated moves lasting for longer time. The competition of both dynamics results in long-lived intermittent transients, the total duration of which can late more than a thousand of seconds. We measure a two-time relaxation function, and relate it via a simple statistical model to a more usual two-time correlation function which exhibits strong similarities with auto-correlation functions found in aging systems. Localized perturbation experiments also allow us to test the pile surface layer receptivity.

arXiv comment9 pages, 10 figures

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• Experimental evidence of ageing and slow restoration of the weak-contact configuration in tilted 3D granular packings
• Sediment creep triggered by porous flow
• Local Coulomb versus Global Failure Criterion for Granular Packings
• The onset and dynamics of avalanches in a rotating cylinder: From experimental data to a new geometric model
• Fluctuations of particle motion in granular avalanches - from the microscopic to the macroscopic scales