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| Titel |
Possible deviations from Griffith’s criterion in shallow slabs, and consequences on slab avalanche release |
| VerfasserIn |
F. Louchet, J. Faillettaz, D. Daudon, N. Bédouin, E. Collet, J. Lhuissier, A.-M. Portal |
| 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 ; 2, no. 3/4 ; Nr. 2, no. 3/4, S.157-161 |
| Datensatznummer |
250000275
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| Publikation (Nr.) |
 copernicus.org/nhess-2-157-2002.pdf |
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| Zusammenfassung |
| Possible reasons for deviations from
Griffith’s criterion in slab avalanche triggerings are examined. In the
case of a major basal crack, we show (i) that the usual form of Griffith’s
criterion is valid if elastic energy is stored in a shallow and hard slab
only, and (ii) that rapid healing of broken ice bonds may lead to shear
toughnesses larger than expected from tensile toughness experiments. In
the case of avalanches resulting from failure of multi-cracked weak
layers, where a simple Griffith’s criterion cannot be applied,
frequency/size plots obtained from discrete elements and cellular automata
simulations are shown to obey scale invariant power law distributions.
These findings are confirmed by both frequency/acoustic emission duration
and frequency/size plots obtained from field data, suggesting that
avalanche triggerings may be described using the formalism of critical
phenomena. |
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