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Ocean Currents-Induced Pipeline Lateral Stability on Sandy Seabed / Fu-Ping Gao in Journal of engineering mechanics, Vol. 133 N°10 (Octobre 2007) 

Public ISBD [article]  in Journal of engineering mechanics > Vol. 133 N°10 (Octobre 2007) . - pp. 1086-1092 Titre : Ocean Currents-Induced Pipeline Lateral Stability on Sandy Seabed Type de document : texte imprimé Auteurs : Fu-Ping Gao, Auteur ; Shuming Yan, Auteur ; Bing Yang, Auteur Année de publication : 2007 Article en page(s) : pp. 1086-1092 Note générale : Mécanique appliquée Langues : Anglais (eng) Mots-clés : Hydrodynamics  Ocean  waves  Sea  floor  Stability  Underwater  pipelines Résumé : Unlike previous mechanical actuator loading methods, in this study, a hydrodynamic loading method was employed in a flow flume for simulating ocean currents induced submarine pipeline stability on a sandy seabed. It has been observed that, in the process of pipeline losing lateral stability in currents, there usually exist three characteristic times: (1) onset of sand scour; (2) slight lateral displacement of pipeline; and (3) breakout of pipeline. An empirical linear relationship is established between the dimensionless submerged weight of pipeline and Froude number for describing pipeline lateral stability in currents, in which the current-pipe-soil coupling effects are reflected. Scale effects are examined with the method of “modeling of models,” and the sand particle size effects on pipeline stability are also discussed. Moreover, the pipeline stability in currents is compared with that in waves, which indicates that the pipeline laid directly upon the sandy seabed is more laterally stable in currents than in waves. ISSN : 0733-9399 En ligne : http://cedb.asce.org/cgi/WWWdisplay.cgi?160815 [article] Ocean Currents-Induced Pipeline Lateral Stability on Sandy Seabed [texte imprimé] / Fu-Ping Gao, Auteur ; Shuming Yan, Auteur ; Bing Yang, Auteur . - 2007 . - pp. 1086-1092. Mécanique appliquée Langues : Anglais (eng) in Journal of engineering mechanics > Vol. 133 N°10 (Octobre 2007) . - pp. 1086-1092 Mots-clés : Hydrodynamics  Ocean  waves  Sea  floor  Stability  Underwater  pipelines Résumé : Unlike previous mechanical actuator loading methods, in this study, a hydrodynamic loading method was employed in a flow flume for simulating ocean currents induced submarine pipeline stability on a sandy seabed. It has been observed that, in the process of pipeline losing lateral stability in currents, there usually exist three characteristic times: (1) onset of sand scour; (2) slight lateral displacement of pipeline; and (3) breakout of pipeline. An empirical linear relationship is established between the dimensionless submerged weight of pipeline and Froude number for describing pipeline lateral stability in currents, in which the current-pipe-soil coupling effects are reflected. Scale effects are examined with the method of “modeling of models,” and the sand particle size effects on pipeline stability are also discussed. Moreover, the pipeline stability in currents is compared with that in waves, which indicates that the pipeline laid directly upon the sandy seabed is more laterally stable in currents than in waves. ISSN : 0733-9399 En ligne : http://cedb.asce.org/cgi/WWWdisplay.cgi?160815