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| Titel |
Half-scale experimental study of rockfall impacts on sandy slopes |
| VerfasserIn |
V. Labiouse, B. Heidenreich |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1561-8633
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| Digitales Dokument |
URL |
| Erschienen |
In: Natural Hazards and Earth System Science ; 9, no. 6 ; Nr. 9, no. 6 (2009-12-03), S.1981-1993 |
| Datensatznummer |
250007065
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| Publikation (Nr.) |
 copernicus.org/nhess-9-1981-2009.pdf |
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| Zusammenfassung |
In the framework of rockfall trajectory modelling, the bouncing phenomenon
occurring when a rock block impacts with the slope surface is the most
difficult to predict, owing to its complexity and its very limited
understanding. To date, the rebound is commonly quantified by means of 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 various impact parameters, a comprehensive
experimental study was undertaken at the LMR-EPFL (Rock Mechanics Laboratory
– Swiss Federal Institute of Technology Lausanne).
After a summary of the main conclusions drawn from a small-scale study, the
paper focuses on half-scale experiments, describing first the testing device
and the data processing and analysing then the influence of several impact
parameters. It is observed that the rebound and the commonly-used
coefficients of restitution expressed for the mass centre of the block depend
not only on slope material characteristics, but also on factors related to
the kinematics (slope inclination and impact velocity) and to the block
(weight, size and shape). As many trajectory computer codes consider constant
coefficients of restitution only function of the outcropping material, the
trajectory results should be interpreted with caution and always checked
against field observations. |
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