Introducing the Shear-Cap Material Criterion to an Ice Rubble Load Model

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Proceedings titleProceedings 18th International Symposium on Ice, IAHR'06
ConferenceProceedings 18th International Symposium on Ice, IAHR'06 : 2006, Sapporo, Japan
Pages193200; # of pages: 8
AbstractCurrent ice rubble load models are based on a cohesive-frictional stress criterion, of which the Mohr-Coulomb (MC) and Drucker-Prager (DP) models are the most widely used. Combining these failure criteria with a shear-cap model as a new material model provides limits to the behaviour of rubble in both deviatoric and hydrostatic stress states. This concept adds a cap yield surface to the DP shear yield criterion bounding the yield surface in hydrostatic compression. The cap yield surface controls the dilatation process by including a volumetric hardening parameter. A detailed parametric analysis has been done to investigate the range of the shear-cap model's parameter values that provide valid results. These parameters have been calibrated to implement the shear-cap material criterion into an analytical load model. This analytical load model calculates the load of interaction between first year ice ridge keels and conical structures. Existing models significantly over-predict the recorded loads measured at the Confederation Bridge Pier (P31). As a result, one of the aims of the newly developed load model is to give calculated load values which correlate well with the Confederation Bridge recorded loads. Comparison has been made between the calculated pressures using the new model and the recorded pressure given by the Confederation Bridge Monitoring Program (Brown, 2006). The comparison showed promising correlation between the calculated and recorded pressures.
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NPARC number12327873
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Record identifier4d0dd4cc-2dde-421f-9dbb-3d3055b23052
Record created2009-09-10
Record modified2016-05-09
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