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Foundation and anchoring systems in soft sediments

Offshore foundations and anchoring systems are being used increasingly in deep water conditions, where the seabed sediments are predominantly soft lightly overconsolidated sediments. The challenges of minimising the high costs of offshore installation without compromising reliability has led to major innovations in foundation types and installation methods, with consequential focus on new and improved analytical models. Examples of these include skirted foundations, where suction, or under pressure, is used to penetrate skirts to the required depth, and novel anchoring systems ranging from high capacity drag anchors to suction caissons. This lecture presents analysis and design methods for a range of foundation and anchoring systems in soft seabed sediments, including skirted foundations, suction emplaced caissons and drag anchors. Simplified analytical models of behaviour are described, the results from which are compared with those from numerical and physical modelling.