PRISE STUDIES ON GOUGE FORCES AND SUBGOUGE DEFORMATIONS

摘要

The Pressure Ridge Ice Scour Experiment (PRISE) joint industry program engaged directed studies to address engineering design and integrity issues for offshore pipelines and subsea facilities in harsh ice environments. One of the main activities for the PRISE program was to assess the significance of subgouge deformations imposed on buried pipelines during ice gouge events. The PRISE joint industry research program conducted analytical, numerical, experimental and field studies. Comparison of field investigations on relict gouge events with centrifuge experiments demonstrated that subgouge deformations should be considered. Models were developed to assess the gouge forces in drained uniform sands, based on the experimental failure mechanism observations. These force models are compared to those of other analytical seabed force models. The implications of the models on ice keel ablation, spoil heap development and the development of subgouge deformations are discussed.