The offshore deep-water oil&gas fields are very often facing the need of installing heavy structures on soft seabed soils, with complex loading acting on the foundations. Service structures which are installed to control the oil&gas production and flowlines like PLETS, ITA, seabed manifolds, are examples of such structures. Different types of foundations are today available for the deep-water seabed (mudmats, suction piles and anchors, etc.), which require a fit for purpose construction and thus are not well suited for automated installation. As it is believed that automated construction will be favourable to the necessary cost reduction of deepwater fields, a research in this direction has been activated. This paper will introduce the results of part of this research program aimed at the study of a new foundation concept, which is being developed within a wider project of automated deep-water foundation construction. Results that will be presented regard a further step of the optimisation study to find the best shape of a foundation formed by crossed plates inserted vertically in soft soils. Geotechnical verification of the resistance of the foundation will be presented in terms of shear and axial force failure envelopes obtained by numerical analyses. The optimisation process will take into account, additionally to the geotechnical performance, the structural compatibility.
The failure envelope of a new shaped cross-plates foundation for deep-water soft soils
Lecture Notes in Civil Engineering
2019-10-11
6 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
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