%0 Journal Article
%T Comportement des s¨¦diments marins carbonat¨¦s Behaviour of Marine Carbonate Sediments
%A Nauroy J. F.
%A Le Tirant P.
%J Oil & Gas Science and Technology
%D 2006
%I Institut Fran?ais du P¨¦trole
%R 10.2516/ogst:1982009
%X Les s¨¦diments carbonat¨¦s recouvrent les fonds marins de nombreuses zones d'activit¨¦s p¨¦troli¨¨res actuelles. La m¨¦connaissance des caract¨¦ristiques m¨¦caniques de ces sols explique en partie les difficult¨¦s rencontr¨¦es pour l'implantation de structures marines. Un important programme d'essais r¨¦alis¨¦s sur divers s¨¦diments carbonat¨¦s a ¨¦t¨¦ effectu¨¦ afin de pr¨¦ciser : - la d¨¦finition d'une m¨¦thodologie d'identification de ces s¨¦diments ; - l'influence de leurs caract¨¦ristiques physiques sur leur comportement m¨¦canique. Le comportement des s¨¦diments carbonat¨¦s, soumis ¨¤ des sollicitations cycliques simulant l'action de la houle sur les fondations d'ouvrages en mer, a ¨¦t¨¦ longuement ¨¦tudi¨¦ ¨¤ l'appareil triaxial et sur un mod¨¨le r¨¦duit de similitude de fondation de structure ¨¤ embase poids en utilisant la technique de centrifugation. Les essais r¨¦alis¨¦s confirment l'importance du seuil caract¨¦ristique comme limite fondamentale dans l'¨¦tude des sables carbonat¨¦s sous chargement cyclique. Carbonate sediments cover the seabed of many areas where petroleum activities are now taking place. Incomplete understanding of the mechanical properties of such formations partly explains the difficulties encountered in installing offshore structures. An extensive testing program involving different carbonate sediments has been carried out for two reasons : (1) to define a methodology for identifying these sediments, and (2) to determine the influence of their physical properties on their mechanical behavior. The behavior of carbonate sediments subjected to cyclic loading, simulating wave action on offshore structures, foundations, has been intensively investigated, using a triaxial devise and with a scale model simulating the foundation of a gravity structure using the centrifuging technique. These tests confirm the importance of the characteristic threshold as the fundamental limit in investigating carbonate sands under cyclic loading.
%U http://dx.doi.org/10.2516/ogst:1982009