Author(s): F. Thunbo Christensen; P. Tryde
Linked Author(s):
Keywords: No Keywords
Abstract: A model for the successive lifting of piles by floating ice sheets during repeated water-level fluctuations is presented. The extraction phenomenon is well known, and numerous theoretical solutions are available. if the theory of elasticity is applicable and if cracks form in certain patterns. Most of the models consider an instantaneous water-level rise to be the cause of pile extraction. None of them describes the successive mechanism where piles are lifted step by step as a result of repeated actions. Since many piles are lifted far more than the maximum water-level fluctuation during relatively short periods of time, a successive mechanism must be the cause of extraction. A model for such a mechanism is presented. The model focuses on the refreezing of the inner circumferential crack. The model will be tested by experiments at the Cold Regions Research and Engineering Laboratory (CRREL) in Hanover, New Hampshire, during the summer of 1984. Only limited results are included in this paper. Due to the complex nature of the phenomenon, only the pile-ice interaction is considered. A detailed analysis should also include the soil-pile interaction as well as a relation between the vertical motions of harbor and nearshore ice and the open-water offshore water-level fluctuation resulting from tides, seiche motion, wind-generated set-ups, and water waves.
Year: 1984