Uplift behaviour of dynamically installed anchor under sustained loading in clay

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Dynamically installed anchors (DIAs) provide a time-efficient and cost-effective alternative to secure offshore floating platforms. The DIA may experience extreme loading events during its operational life, causing noticeable movement. In the post-movement stage, the sustained load applied on the DIA will further affect its bearing performance. In this paper, a series of laboratory model tests was conducted to investigate the post-movement uplift behaviour of the DIA under sustained loading conditions, either with fixed loading or fixed anchor position. Test results demonstrate that the uplift capacity of the anchor is enhanced due to the reconsolidation of the soil during the loading process, and the degree of enhancement is related to the sustained loading conditions. The magnitude of enhancement of the uplift capacity of the anchor under fixed loading conditions is greater than that under fixed position conditions. Additionally, the anchor experiences slight upward movement under the fixed loading condition, while experiences a gradual decrease of the uplift load under the fixed position condition. The suction at the bottom of the anchor gradually reduces attributed to the dissipation of the excess pore pressure, leading to a reduction of the measured uplift load. Notably, this phenomenon is independent on the movement distance of the anchor during the extreme loading event.

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

13 - Developmental foundation and anchoring concepts: hybrid foundations, ring anchors, helical piles, torpedo, shared anchoring