Sensitivity to solid volume fraction of gravitational instability in a granular medium
Granular Matter(2010)
摘要
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, analyzed 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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关键词
Gravitational instability,Avalanche,Collapse,Granular flows
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