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An Alternate Statistical Interpretation of the Strength Snow

  • H. Gubler (a1)

Abstract

The basic features of the statistical models to describe brittle and ductile strength of snow are outlined and discussed. The concept of the "fundamental unit" is introduced. The models are applied to estimate the development of slab stability during heavy snowfalls and to simulate measurements of the tensile strength of snow using the centrifugal method as a function of the load rate. The models developed in this paper are compared with Sommerfeld’s applications of statistical methods to estimate the strength of snow in the starting zone of a slab avalanche.

Résumé

Les propriétés fondamentales de quelques modéles statistiques qui caractérisent la résistance ductile et cassante á la rupture de la neige sont décrites et discutées. L’idée des unités elementaires introduite. A partir de ces modèles on estime le développement de la stabilité dans la zone de décrochement d'une plaque de neige pendant une importante chute de neige. De méme, la résistance de la neige à la traction qui est mesurée avec une centrifugeuse est simuleé en fonction de la vitesse d'application de la charge. Les modèles décrits sont comparés à ceux que Sommerfeld a utilisés pour déterminer la résistance dans la zone de décrochement de plaques de neige.

Zusammenfassung

Die grundlegenden Eigenschaften von statistisch en Modellen zur Beschreibung d er Spröd- und Zähbruchfestigkeit von Schnee werden beschrieben und diskutiert. Das Konzept der Elementareinheit wird eingeführt. Aufgrund der Modelle werden die Stabilitätsentwicklung im Anrissgebiet einer Schneebrettlawine während eines Grosschneefalles sowi e die Messung der Zugfestigkeit von Schnee mittels einer Zentrifuge als Funktion der Spannungsgeschwindigkeit simuliert. Die beschriebenen Modelle werden mit Sommerfeld's Anwendung statistischer Methoden z u r Bestimmung der Festigkeit in Anrissgebieten von Schneebrettlawinen vergli ch en.

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Copyright

References

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An Alternate Statistical Interpretation of the Strength Snow

  • H. Gubler (a1)

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