Author(s): J. C. Tatinclaux; S. T. Cheng
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Keywords: No Keywords
Abstract: The results of laboratory experimental investigations of river ice-jams characteristics are presented. It was found that the friction factor at the jam flow interface could be expressed as an increasing exponential function of the ratio of jam thickness by depth of flow beneath jam, at least within the range of parameters investigated. The ratio of the critical submergence velocity of long floes (of aspect ratio thickness over length, ti/L, less than 0.1) by that predicted by Ashton's formula for values ti/L> 0.1 was found to be a linear decreasing function of ti/L. Finally experimental data on the compressive strength and shearing strength of floating fragmented ice cover of thickness, indicate that stress over thickness initially decreases with the rate of strain, then becomes constant independently of both jam thickness and rate of strain. On the other hand, shearing strength increases with both thickness and the rate of strain; however as the latter increases the rate of variation of shear strength with thickness diminishes and shear strength is expected to become independent of thickness when the rate of strain exceeds a certain limit yet to be determined.
Year: 1978