Dynamic Soil-Structure Interaction evaluations of liquefaction-induced settlements of a Pipeline End Manifold (PLEM)
Dynamic Soil-Structure Interaction evaluations of liquefaction-induced settlements of a Pipeline End Manifold (PLEM)
The seismic performance of an offshore Pipeline End Manifold (PLEM) structure founded on liquefiable soils was analysed by means of simplified triggering analyses, 1D effective stress dynamic analyses and 3D Soil-Structure-Interaction (SSI) dynamic analyses. The numerical analyses employ the Ta-Ger constitutive model, calibrated against project specific test data, as well as state-of-the-art techniques. Results showed that simplified analyses can overestimate both the liquefaction potential and the associated settlements. While site response analyses produce more rational estimates of liquefaction potential, they can overestimate deformations as they do not account for 3D interaction effects. 3D dynamic analyses provide more rational deformation estimates showing that the overall seismic performance of the various components of the structure (i.e., PLEM foundation and pipelines) is not jeopardized as estimated settlements and horizontal displacements remain low.
Y. K. Chaloulos; S. GIANNAKOS; T. Limnaiou; C. Tsifis; Amalia Giannakou; Jacob Chacko; Arjen Meijer; Gabriel Vazquez Perez; Christian Hoffmann
5th International Symposium on Frontiers in Offshore Geotechnics (ISFOG2025)
15 - Mooring lines, Cables, Pipelines, Immersed tunnels and Risers
https://doi.org/10.53243/ISFOG2025-204
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