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Elastic wave generated by granular impact on rough and erodible surfaces

Bachelet, Vincent and Mangeney, Anne and de Rosny, Julien and Toussaint, Renaud and Farin, Maxime (2018) Elastic wave generated by granular impact on rough and erodible surfaces. Journal of Applied Physics, 123 (4). Art. No. 044901. ISSN 0021-8979. doi:10.1063/1.5012979.

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The elastic waves generated by impactors hitting rough and erodible surfaces are studied. For this purpose, beads of variable materials, diameters, and velocities are dropped on (i) a smooth PMMA plate, (ii) stuck glass beads on the PMMA plate to create roughness, and (iii) the rough plate covered with layers of free particles to investigate erodible beds. The Hertz model validity to describe impacts on a smooth surface is confirmed. For rough and erodible surfaces, an empirical scaling law that relates the elastic energy to the radius Rb and normal velocity Vz of the impactor is deduced from experimental data. In addition, the radiated elastic energy is found to decrease exponentially with respect to the bed thickness. Lastly, we show that the variability of the elastic energy among shocks increases from some percents to 70% between smooth and erodible surfaces. This work is a first step to better quantify seismic emissions of rock impacts in natural environment, in particular on unconsolidated soils.

Item Type:Article
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Farin, Maxime0000-0002-0250-2499
Additional Information:© 2018 American Institute of Physics. Received 9 November 2017; accepted 2 January 2018; published online 23 January 2018. This work has been funded by the ERC Contract No. ERC-CG-2013-PE10-617472 SLIDEQUAKES. We thank J. Laurent and P. Gondret for fruitful discussions.
Funding AgencyGrant Number
European Research Council (ERC)ERC-CG-2013-PE10-617472 SLIDEQUAKES
Issue or Number:4
Record Number:CaltechAUTHORS:20180131-111059405
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:84599
Deposited By: Ruth Sustaita
Deposited On:31 Jan 2018 19:25
Last Modified:15 Nov 2021 20:21

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