Breakdown of Scaling and Friction Weakening in Intermittent Granular Flow.

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ID: 75022
2019
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Abstract
Many materials are produced, processed and stored as grains, while granularity of matter can be crucial in triggering potentially catastrophic geological events like landslides, avalanches and earthquakes. The response of grain assemblies to shear stress is therefore of utmost relevance to both human and natural environment. At low shear rate a granular system flows intermittently by distinct avalanches. In such state the avalanche velocity in time is expected to follow a symmetrical and universal average behavior, whose dependence on the slip size reduces to a scale factor. Analyzing data from long lasting experiments, we observe a breakdown of this scaling: While in short slips velocity shows indeed a self-similar and symmetric profile, it does not in long slips. The investigation of frictional response in these different regimes evidences that this breakdown can be traced back to the onset of a friction weakening, which is of dynamical origin and can amplify instabilities exactly in this critical state, the most frequent state for natural hazards.
Reference Key
baldassarri2019breakdownscientific Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Baldassarri, A;Annunziata, M A;Gnoli, A;Pontuale, G;Petri, A;
Journal Scientific reports
Year 2019
DOI
10.1038/s41598-019-53178-2
URL
Keywords
marine protected area earthquake seagrass subsidence tetepare tsunami wave

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