An investigation of the failure envelope of granular/discontinuous-columnar sea ice
The three-dimensional failure envelope for granular/ discontinuous-columnar sea ice has been investigated over a range of nominal strain rates from 9 X 10[-6]s[-1] to 4.4 X 10[-4]s[-1] by using confined compression tests. Both the applied load and side-confining load were measured. The tests were pe...
| Published in: | Cold Regions Science and Technology |
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| Main Authors: | , |
| Format: | Article in Journal/Newspaper |
| Language: | English |
| Published: |
1984
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| Subjects: | |
| Online Access: | https://doi.org/10.1016/0165-232X(84)90044-2 https://nrc-publications.canada.ca/eng/view/ft/?id=630d117e-4912-4c49-b8e6-2b9aab8bf95a https://nrc-publications.canada.ca/eng/view/object/?id=630d117e-4912-4c49-b8e6-2b9aab8bf95a https://nrc-publications.canada.ca/fra/voir/objet/?id=630d117e-4912-4c49-b8e6-2b9aab8bf95a |
| Summary: | The three-dimensional failure envelope for granular/ discontinuous-columnar sea ice has been investigated over a range of nominal strain rates from 9 X 10[-6]s[-1] to 4.4 X 10[-4]s[-1] by using confined compression tests. Both the applied load and side-confining load were measured. The tests were performed on samples cut from a solid block of ice in the Beaufort Sea which structurally was granular with some banding of discontinuous-columnar ice to a depth of 1.2 m. The results indicate the overall shape and size of the failure envelope of this ice, and show that although the shape is independent of loading rate, the size increases with loading rate. An analytical expression is derived which mathematically describes the failure envelope in three- dimensional space. L'enveloppe tridimensionnelle de rupture de la glace columnaire discontinue/granulaire a fait l'objet d'études au moyen d'essais de compression avec étreinte latérale, dans un intervalle de vitesses de déformation nominale allant de 9 x 10[-6]s[-1] à 4,4 x 10[-4]s[-1]. On a mesuré à la fois la charge appliquée et l'étreinte latérale. Les essais ont été effectués sur des échantillons découpés dans un bloc de glace solide provenant de la mer de Beaufort; cette glace était de structure granulaire et contenait quelques bandes de glace columnaire discontinue jusqu'à 1,2 m de profondeur. Les résultats indiquent la configuration et la dimension générales de l'enveloppe de rupture de cette glace, et démontrent que même si la configuration ne dépend pas de la vitesse d'application de la charge, la dimension augmente en fonction de cette vitesse d'application. On en déduit une expression analytique, qui décrit de facon mathématique l'enveloppe de rupture dans un espace tridimensionnel. Peer reviewed: Yes NRC publication: Yes |
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