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Short Note on Slab-Avalanche Measurements

  • R. Perla (a1)

Abstract

From a study of 205 slab avalanches it is concluded that failure initiates where the slope is 25° or steeper, that slab failure stress is in the range 102N m-2 to 104N m-2, and that the slab failure plane is most commonly at a temperature of -5°C or warmer. The study also indicates that the shear strength of weak layers varies approximately as the square of the density.

Résumé

A partir de l'étude de 205 avalanches de plaque, on conclut que la rupture se produit là où la pente est de 25° ou plus forte, que l'effort au moment de la rupture de la plaque est de l'ordre de 102N/m2à 104N/m2 et que le plan de la rupture de plaque est le plus souvent à une température égale ou supérieure à —5°C. L'étude montre aussi que la résistance au cisaillement des niveaux faibles varie approximativement comme le carré de la densité.

Zusammenfassung

Aus der Untersuchung von 205 Schneebrettlawinen ergibt sich, dass der Bruch bei Hangneigungen von 25° oder mehr eintritt, dass die Bruchspannung zwischen 102N m-2und 104N m-2 liegt und dass die Bruchfläche meistens eine Temperatur von —5°C oder mehr besitzt. Die Studie zeigt weiter, dass die Scherfestigkeit weicher Schichten sich annähernd mit dem Quadrat der Dichte verändert.

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Copyright

References

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Perla,, R. 1977. Slab avalanche measurements. Canadian Geotechnical Journal, Vol.14, No.2, p.20613.

Short Note on Slab-Avalanche Measurements

  • R. Perla (a1)

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