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Soil Structure Interaction

The soil structure interaction modelling is governed by the specification of P-y curves, which define the soil resistance to lateral motion of the structure, over a range of depths below the mudline. The appropriate (non-linear) soil stiffness is then applied to nodes of the finite element model at locations along the length of the conductor/casing corresponding to the depths at which P-y curves are defined.

Each P-y curve may be specified at a particular depth below the mudline, or alternatively at a node of the FE discretisation. The latter approach permits a more general specification of P-y curves, for example, with models of multiple risers, and is the approach used here. The actual curves themselves are presented in Input Data.