Numerical modelling of undrained vertical load-displacement behaviour of offshore pipeline using coupled analysis

M. Senthilkumar, J. Kodikara, P. Rajeev

In the proceedings of: GEO2011: 64th Canadian Geotechnical Conference, 14th Pan-American Conference on Soil Mechanics and Geotechnical Engineering, 5th Pan-American Conference on Teaching and Learning of Geotechnical Engineering

Session: Other General

ABSTRACT: Predicting the initial embedment of an offshore pipeline is one of the important design considerations for on bottom stability analysis. This paper reviews the current state of the art to predict the initial embedment, and presents numerical modelling to perform the coupled analysis of pipe-seabed system. Two dimensional plane strain, axis-symmetry model was developed using ABAQUS computer program. Soil was modelled using both Mohr-Coulomb with uniform undrained shear strength and modified Cam-clay obeying Biot consolidation while the pipe was assumed to be rigid. Both undrained and drained loadings were performed in displacement control manner to develop the load-displacement behaviour. The results were benchmarked to the analytical solutions available in literature.

RÉSUMÉ: Prédire l'ancrage initial d'un gazoduc sous-marin est l'un des considérations de conception important pour la stabilité sur l'analyse de fond. Ce document passe en revue l'état actuel de l'art de prédire l'ancrage initial, et présente la modélisation numérique pour effectuer l'analyse couplée de réseau de conduites-sol marin. Deux souche plan bidimensionnel, modèle de l'axe de symétrie a été développé en utilisant le programme informatique ABAQUS. Du sol a été modélisé en utilisant à la fois de Mohr-Coulomb avec la résistance au cisaillement non drainée uniforme et modification de Cam-clay consolidation obéissant à Biot tandis que le tuyau était censée être rigide. Les deux chargements non drainés et drainés ont été effectués de la manière de commande de déplacement à développer le comportement charge-déplacement. Les résultats ont été comparés aux solutions analytiques disponibles dans la littérature.

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Cite this article:
M. Senthilkumar; J. Kodikara; P. Rajeev (2011) Numerical modelling of undrained vertical load-displacement behaviour of offshore pipeline using coupled analysis in GEO2011. Ottawa, Ontario: Canadian Geotechnical Society.

@article{GEO11Paper1102,author = M. Senthilkumar; J. Kodikara; P. Rajeev ,title = Numerical modelling of undrained vertical load-displacement behaviour of offshore pipeline using coupled analysis,year = 2011}