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NRC Publications Archive Archives des publications du CNRCThis publication could be one of several versions: author's original, accepted manuscript or the publisher's version. / La version de cette publication peut être l'une des suivantes : la version prépublication de l'auteur, la version acceptée du manuscrit ou la version de l'éditeur. Geotechnical Journal, 25, 4, pp. 726-734, 1988-11 Field measurements of stresses and deformations in a first-year ice cover adjacent to a wide structure Sayed, M.; Frederking, R. M. W.; Wessels, E. (1984, 1986a, b) reported on the The design of offshore structures in many Arctic regions requires a knowledge of the behaviour of the ice cover as it impinges on wide obstacles. Some information on expected loads due to first-year ice is now available from monitoring programs carried out in the Beaufort Sea (e.g., Metge 1976; Semeniuk 1977;Pilkington et al. 1983;Johnson et al. 1985). Those field programs were focused on ice force measurements; information on the corresponding ice conditions, movements, and deformation is limited. Conseauentlv. the data are insufficient to develop an understanding bf ici cover behaviour.
CanadianTo date, attempts to model ice interaction with structures have used ice properties obtained by testing small samples to solve an indentation problem. Ralston (1978) developed an upper bound plastic limit solution. Ponter et al. (1983) and Bruen and Vivatrat (1984) used creep equations for ice. A review article by Sanderson (1984) gives an evaluation of the various models. More recently, Shyam Sunder (1986) used a fracture criterion in conjunction with a viscoelastic model and thus incorporated a "scale" factor.However, an actual ice cover usually includes numerous irregular features (rafted ice, ridges, cracks, and open leads) and experiences locally a number of nonsteady (sporadic) and three-dimensional deformation modes. The deformation history of different parts of the ice cover may vary as well. As a result, considerable uncertainty regarding the validity of the above continuum models exists. Full-scale measurements are still needed to guide the development of appropriate models.The present paper reports on studies undertaken as a part of the Adarns Island project. Ice cover behaviour near a natural island was monitored in order to develop an understanding of the interaction between floating ice covers and wide structures. Ice movements, properties, and stresses, water current, tide, and meteorological conditions were measured over three
