EPJ Web Conf.
Volume 249, 2021Powders & Grains 2021 – 9th International Conference on Micromechanics on Granular Media
|Number of page(s)||4|
|Section||Environmental Granular Processes|
|Published online||07 June 2021|
Mobilisation of friction in unstationary flows down a model topography
Ecole Normale Supérieure de Lyon, 69342 Lyon, France
2 Institut d’Alembert - CNRS - Université Paris Sorbonne, 75252 Paris, France
Published online: 7 June 2021
The frictional behaviour of a series of numerical 2D granular mass flows down a model topography is analysed. Effective friction coefficients estimated from final deposits are compared with data from documented natural geophysical flows, and show a consistent behaviour as far as run-out distances are concerned. The latter is used to estimate effective friction coefficients which capture well the frictional behaviour derived from the computation of micro-mechanical stress tensors near the gravity centre. Distinguishing between the different parts of the mass while spreading, we show that the downstream part of the flow exhibits a much larger friction than the core and the tail. A dependence between friction and flow volume is however observed in each region.
A video is available at https://doi.org/10.48448/e1zc-v309
© The Authors, published by EDP Sciences, 2021
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