Effect of pad eye position on anchor pile response and soil displacement field under oblique pullout load

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4. Effect of pad eye position on anchor pile response and soil displacement field under oblique pullout load

Anchor piles have been extensively utilized to support offshore floating platform and must have sufficient bearing capacity to resist oblique pullout loads transmitted from mooring chains. The bearing capacity of anchor piles under oblique pullout loads depends on pad eye positions (z/L, L is the pile length). However, the effect of pad eye positions on the anchor pile response and soil displacement field is still unclear. Based on transparent sand, a series of centrifuge model tests were performed on the anchor pile subjected to oblique pullout loads. The pile capacity and soil displacement under different pad eye positions were studied. It shows that with the increase of the pad eye position, the rotation direction of the anchor pile gradually changed from forward rotation to backward rotation, and the deformation range and displacement value (especially horizontal displacement) of deep soil increased. Therefore, the pile bearing capacity with z/L = 0.55, 0.67 and 0.75 improved 45%, 76% and 131% of that with z/L = 0.40. As the pad eye position increased from 0.67L to 0.75L, the pile failure mode transformed from vertically dominated pulling to translation with rotation and lateral deflection, and the displacement value and ratio of horizontal to vertical displacement increased by 30% and 36% in deep soil, respectively.

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

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