Thèse de Vincent Bachelet | INSTITUT DE PHYSIQUE DU GLOBE DE PARIS

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  Thèse de Vincent Bachelet

Experimental study of acoustic emissions from granular flows
Encadrant (et co-encadrant) : 
Julien de Rosny (Institut Langevin)
Renaud Toussaint (EOST)
Résumé: 

The aim of this thesis is to deduce the landslides properties, from the generated signal emitted during the event. It is addressed with both laboratory experiments and simulations. In practice, regarding the experimental part, a set-up using a combination of optical and acoustic methods is employed, in order to measure the seismic signal generated by, (i) the impact of beads of different properties, (ii) the collapse of granular columns, over horizontal and sloping substrates. Farin et al. have showed that it exists a link between the properties of an impacting bead (mass and  velocity) on smooth surfaces and the emitted signal (energy and mean frequency). We would like to confront this to surfaces with rougness and erosion. Experimental situation is compared to a Discrete Elements Method simulation developed by Patrick Richard (IFSTTAR), which computes trajectories of each particle of a granular flow, and deduces synthetic signal generated by the impacts.

Date de soutenance: 
Monday 05 February 2018 - 10:00