Steel catenary risers (SCR) are an enabling technology for deepwater environments. Tools to analyse and design SCRs are available which show that the point where the riser first touches the soil, termed the touchdown point (TDP), exhibits complex behaviour that has been the subject of a number of recent research programmes. The soil parameters used in SCR analysis can have a significant effect on riser response, especially the predicted fatigue life.If soil parameters and analytical models are chosen too conservatively they can make the predicted fatigue life unrealistically low, conversely using non-conservative soil parameters and soft soil models results in fatigue lives that may be unrealistically high.This paper describes state of the art vertical pipe/soil interaction models developed for use in SCR analysis. These model pipe movement vertically downwards (soil stiffness) and vertically upwards (soil suction). The models are based upon test data from the STRIDE and CARISIMA JIP's and information from existing papers. The models are currently being used in many Gulf of Mexico deepwater projects that involve SCRs.
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