Large deformation finite element analysis of partially embedded offshore pipelines for vertical and lateral motion at seabed

摘要: Subsea pipelines play a significant role in transporting hydrocarbon from offshore. For both shallow and deep water, an effective means of transportation is the usage pipeline. However, water are expensive to bury economic way lay on seabed. Due pipe installation procedures (e.g. wave action, self weight etc.), could penetrate into seabed fraction its diameter. Pipelines might experience thermal expansion (due low ambient high internal temperature) during operation cycles which can cause expand axially. But due restraining conditions accumulated soil/pipe interaction longitudinal force along pipeline, bending moments develop pipelines, buckle laterally. This lateral buckling resisted mainly through interaction. In addition, berm formed around (during period) plays vital resisting movements. Thus, accurate prediction as-laid pipeline very important for development design guidelines. To address this critical phenomenon, first step capture soil behaviour vertical penetration with formulation mechanism. large deformation problem. solve problem numerically, numerical tool required. study, Coupled Eulerian Lagrangian (CEL) finite element method used analysis partially embedded pipelines. Analyses performed using ABAQUS 6.10-EFl software. sea, undrained shear strength clay typically increases depth. strain rate dependent. Moreover, softening another phenomenon that should be considered. The standard von Mises yield constitutive model available cannot behaviour. Therefore, study advanced considered these phenomena implemented user subroutines programmed FORTRAN. Results compared centrifuge test results other solutions literature. [t shown approach together modelling movement.