Submarine debris flows are an extremely complex phenomenon that involves phase transition ofthe material from solid to semi-fluid. This is caused by large deformation and possible occurrence of entrainingambient fluid. In the conventional ‘equivalent fluid method’ based on Non-Newtonian fluid models, constantrheological parameters are assumed and calibrated using the evidence of previous debris flows. Such parameters,however, do not accurately represent the material behavior and the real physics involved in submarine debrisflows. The aim of this study is to develop a new modeling framework for submarine debris flows based onthe critical state soil mechanics. The effect of phase transition is incorporated in a modified Cam clay basedconstitutive model. The diagnostic analyses indicate that the proposed model is capable of reproducing theprevious flow event by using the material parameters derived from the conventional soil tests.
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