Ice stress measurements in a rubble field surrounding a caisson-retained island

• Main Authors: Sayed, M., Frederking, R. M. W., Croasdale, K. R.
• Format: Article in Journal/Newspaper
• Language: English
• Published: 1986
• Subjects: ice loads; islands; caissons; rubble movements; geometry; composition; thermal expansion; floating ice forces; charge de glace; ile; caisson (matériel); Mer de Beaufort; Beaufort Sea
• Online Access: https://nrc-publications.canada.ca/eng/view/ft/?id=625916cf-68c8-4751-9542-9eba0d893ee9; https://nrc-publications.canada.ca/eng/view/object/?id=625916cf-68c8-4751-9542-9eba0d893ee9; https://nrc-publications.canada.ca/fra/voir/objet/?id=625916cf-68c8-4751-9542-9eba0d893ee9

Stresses were measured in the rubble field surrounding a caisson-retained island in the southern Beaufort Sea. The rubble movements, geometry and composition were examined. The maximum stress, near the edge of the rubble field, was approximately 200 kPa, apparently caused by thermal expansion of the ice between the shore and the island. Stresses measured near the caisson were negligible, which suggests that all forces applied by the floating ice were resisted by grounding of the rubble. Movements of the rubble during the observation period were also negligible. On a mesuré les contraintes qui s'exercaient dans le champ de fragments entourant un îlot-caisson dans le Sud de la mer de Beaufort. Les mouvements, la géométrie et la composition des fragments ont été examinés. La contrainte maximale, près du bord du champ de fragments, était de 200 kPa, ce qui était attribuable, semble-t-il, à l'expansion thermique de la glace se trouvant entre le rivage et l'îlot. Les contraintes mesurées près du caisson étaient négligeables, ce qui semble indiquer que l'amoncellement de fragments ancrés au sol absorbaient toutes les forces exercées par la glace flottante. Les mouvements des fragments pendant la période d'observation se sont aussi avérés négligeables. Peer reviewed: Yes NRC publication: Yes