Sensitivity to solid volume fraction of gravitational instability in a granular medium

Bonnet, Fabrice; Richard, T.; Philippe, P.

Sensitivity to solid volume fraction of gravitational instability in a granular medium

2010

Bonnet, Fabrice | Richard, T. | Philippe, P.

We report experimental results on incipient dynamics of gravitational destabilization in an immersed granular medium. Two protocols have been used to reach instability: a progressive loading and a dam-break situation. The instability triggering, analysed by high-speed imaging and CIV post-processing, reveals distinct dynamical behaviours depending on the initial packing fraction of the medium. Two destabilisation modes have been observed: a surface avalanche and a deeper phenomenon that we called circular collapse.

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