Effects of the Active Suction on the Uplift Capacity of Suction Caissons in Sand

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4. Effects of the Active Suction on the Uplift Capacity of Suction Caissons in Sand

Suction caissons can be employed in the construction of a wide range of floating renewable energy facilities, including floating offshore wind turbines. The design of suction caissons in sand must account for the uplift capacity, as this controls the performance in both operational and extreme loading conditions. In the event of tensile vertical loading, different mechanisms can develop, depending on the onset of differential suction under the lid, that can ultimately contribute to the overall capacity of the anchor. In this regard, the active suction concept arises as an alternative to enhance the performance of suction anchors. The applicability of the active suction has been demonstrated through field and centrifuge testing, indicating the potential for further development of this concept. This paper examines the application of active suction using the finite element method of analysis. The results are validated against a field test conducted on a suction caisson in sand, which was subjected to successive loading stages while applying suction. The developing mechanism, the drainage conditions and variables that affect the overall response are addressed. It is found that the overall mechanism is frictional, with near drained conditions occurring. The results show that active suction in this example contributes to the uplift capacity. Moreover, variables such as friction along the skirt, relative density and permeability also affect the capacity of the caisson.

5th International Symposium on Frontiers in Offshore Geotechnics (ISFOG2025)

11 - Suction installed foundations and anchors