Interaction Mechanisms between Submarine Landslides and Offshore Monopile Foundations: Centrifuge Modelling

Publication Title
Interaction Mechanisms between Submarine Landslides and Offshore Monopile Foundations: Centrifuge Modelling

Abstract

This study investigates submarine landslide-monopile interaction using geotechnical centrifuge modelling of a monopile embedded in a submerged clayey sand slope subjected to long-term water infiltration. Results indicated that monopile response transitioned from an approximately linear, displacement-controlled regime at small slope displacements ( 1.0 m) to a strongly nonlinear regime as slope instability developed. Moreover, rapid monopile displacement was triggered once the pore water pressure ratio exceeded a threshold of ~0.35, ultimately leading to global slope failure at slope displacements larger than ~4 m. The observed data demonstrated that monopile response was governed by imposed kinematic demand rather than bearing capacity, highlighting the need for displacement-based design of OWT foundations in hazard-prone seabeds.

Authors
Ali Lashgari; Amin Barari; A. K. Leung; S. Jannie Nielsen

Published In

11th International Conference on Physical Modelling in Geotechnics (ICPMG2026)

Theme

Session 6: Onshore and offshore foundation systems