The Role of Stress Concentration in Slab Avalanche Release

Abstract Slab avalanches are shown to be released by brittle fracture. An analogy is drawn in which the snow-pack is considered to be a macroscopic, molecular model of glass. The analogy is examined qualitatively from two viewpoints: the Griffith fracture criterion, and stress concentration theory....

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Bibliographic Details
Published in:Journal of Glaciology
Main Author: Sommerfeld, R. A.
Format: Article in Journal/Newspaper
Language:English
Published: Cambridge University Press (CUP) 1969
Subjects:
Online Access:http://dx.doi.org/10.1017/s0022143000027039
https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000027039
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Summary:Abstract Slab avalanches are shown to be released by brittle fracture. An analogy is drawn in which the snow-pack is considered to be a macroscopic, molecular model of glass. The analogy is examined qualitatively from two viewpoints: the Griffith fracture criterion, and stress concentration theory. The details of fracture propagation in a layered snow-pack are explained by means of stress concentration theory, and many details of slab avalanches are shown to be consistent with the proposed mechanism. The significance of various fracture surface markings is pointed out.