Author(s): Jaakko Heinonen; Kari Kolari
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Keywords: No Keywords
Abstract: The objectives were to develop a material model for the consolidated layer and to study how it behaves together with underlying ice rubble. These internal parts of an ice ridge and the interaction between them have a major role during ridge action on sloping structures. Experimental tests of the consolidated layer bending were carried out in ridged area in Marjaniemi, Finnish side of the Gulf of Bothnia. Consolidated layer bending without and with underlying ice rubble were analysed and simulated numerically to study the mechanical behaviour of the consolidated layer and the interaction with underlying rubble. An appropriate material model was developed to include the main features of the consolidated layer. The material parameters were distributed both in the horizontal plane and in the vertical direction. The distributed quantities, the tensile and compressive strength and the elastic modulus, were based on laboratory scale measurements. Temperature correction was used to take into account different temperature profiles between the field and laboratory tests. The constitutive relation in the consolidated layer was based on Continuum Damage Mechanics model (Kolari, 2007). A shear-cap model was used to introduce the shear and compaction failure in ice rubble (Heinonen, 2004). The material parameters, like cohesion and friction angle, were determined by earlier punch shear tests in the same area. Simulations of cantilever beam bending indicated similar failure pattern as obtained in the tests. The bending without underlying rubble resulted in excellent correlation with the experiments. The bending with underlying rubble showed the location of crack in the consolidated layer to be close to the loading area, not in the opposite end. This pointed out plausible behaviour of the underlying rubble and interaction with the consolidated layer.
Year: 2012