FEPLA advances: First geotechnical tests validate offshore solution

Intermoor, Acteon’s Moorings and Anchors business line, has completed the first phase of model testing for its Flexibly Embedded Plate Anchor (FEPLA) at the University of Dundee Geotechnical Engineering Facility.  

The FEPLA represents a next generation anchoring solution for complex offshore energy projects. Building on established plate anchor technology, it features an innovative embedment system designed to perform reliably across a broad spectrum of soil conditions - including sand, clay, and mixed layers.  

The initial tests focused on vibro-hammer embedment and pullout capacity in sand, using a 1/60 scale model in 1g environment. These tests validated the apparatus ahead of planned centrifuge trials and provided valuable insights into the behavior of a closed-ended follower, analogous to a closed-ended pile.    

Specific learnings from these tests include: 

• Consistent embedment depths achieved using vibro-hammer and closed-ended follower.
• Performance of various follower tip shapes documented.
• Anchor tilt during penetration remained within design tolerances.
• Effective plate anchor keying observed in sand.
• Ultimate pullout capacity aligned with empirical predictions. 

The results added new insights into the vibro-embedment of closed-ended piles, a topic with limited prior study. The FEPLA test programme continues to refine analytical simulations and optimise anchor design and installation tools. 

Stay tuned for further updates on the FEPLA anchor system and contact us if you have a project that could take this innovation into the field.