Small-scale experimental study of rockfall impacts on granular slopes

 

In the framework of rockfall trajectory modelling, the bouncing phenomenon occurring when a rock block impacts with the slope surface is undoubtedly the most difficult to predict, owing to its complexity and its very limited understanding.

 

In the framework of rockfall trajectory modelling, the bouncing phenomenon occurring when a rock block impacts with the slope surface is undoubtedly the most difficult to predict, owing to its complexity and its very limited understanding.

To date, the rebound is commonly quantified by means of (one or) two coefficients of restitution estimated from a rough description of the ground material. To acquire a better knowledge of the bouncing phenomenon and to investigate the influence of the various impact parameters, a comprehensive laboratory testing campaign is undertaken at the LMR EPFL on small— and halfscale models. This paper focuses first on the former experiments, describing the testing device and data processing. Then, by comparing data from different testing series, the paper presents the influence of some impact parameters. It is obsewed that the rebound and the commonly—used coefficients of restitution depend not only on slope material characteristics such as friction angle and compaction degree, but also on factors related to the kinematics (impact angle and impact direction) and to the block (weight). Finally, some explanations are given on the half—scale experiments in progress at the LMR-EPFL in order to quantify properly the rebound of blocks on natural slopes. The aim is a better prediction of block trajectories and subsequently a better delineation of areas at risk (hazard maps).


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AUTORI: Heidenreich B., Labiouse V.
RIG ANNO:2003 NUMERO:2
Numero di pagine: 80


Allegato: https://associazionegeotecnica.it/wp-content/uploads/2010/03/RIG_2004_2_80.pdf
Allegato:
Articolo completo: https://associazionegeotecnica.it/wp-content/uploads/2010/03/RIG_2004_2_80.pdf