Calibration of Verley and Sotberg Soil Resistance Model for Pipelines Placed on Calcareous Soils

摘要

On-bottom stability of subsea pipelines has been the focus ofrnsubstantial research in recent years with particular emphasis on therntopic of pipe-soil interaction. Numerous models have been developed tornpredict the pipe-soil interaction behavior under combined vertical andrnhorizontal loading scenarios. The Verley and Sotberg energy based soilrnresistance model for silica sand is among these models. The model isrnrecommended by Det Norske Veritas (DNV) and widely accepted andrnused by subsea pipeline design industry to model the pipe-soilrninteraction on silica sand soils. Calcareous sand soils are found in manyrnof the world's offshore hydrocarbon development regions includingrnoffshore of Western Australia. The engineering characteristics of therncalcareous sand are different from those of the typical silica sand soils.rnAs such, Verley and Sotberg parameters for silica sand soils are notrnsuitable for calcareous sand soils. This paper presents a calibration ofrnthe Verley and Sotberg silica sand soil resistance model for calcareousrnsand soil conditions using the results of a set of centrifuge tests of arnpipe model on calcareous sand soil.