Autre(s) titre(s) |
Deep water geotechnical testing. |
Type |
Communication avec actes |
Date |
1990-12 |
Langue(s) |
Français |
Auteur(s) |
Cochonat Pierre, Dansy G, Leduc Bernard, Meunier Jacques, Harmegnies Francois, Floury L |
Conférence |
Intervention Sous-Marine ISM 90, Toulon (France), 3-5 Dec 1990 |
Source |
Actes de colloques. Ifremer. Brest [ACTES COLLOQ. IFREMER.]. 1991 |
Keyword(s) |
Submarine cables, Deep sea mining, Offshore equipment, Geotechnology, Submersibles, Sedimentary structures, Sedimentology, Ferromanganese nodules, Instability, Marine technology, Sediments, Ocean floor, Deep water |
Résumé en anglais |
The mechanical behaviour of sediments is usually studied from laboratory core analyses which do not take into account the real state of in-situ stresses. Therefore, the aimed purpose is presently to determine the in-situ geotechnical properties which mainly depend on the relationship between fine-grained particles and intergranular fluids. At IFREMER, these achievements have been pursued in the framework of 2 scientific program: "Nodules and Sedimentary Processes and Instability on Slopes, for which surficial measurements were conducted on selected seafloor targets usually pre-defined from high resolution geophysical data." 2 kinds of instrumentation were developed in correlation to 2 different strategies of handling at sea. There is the instrumentation of the submersible "Le Nautile" equipped with a vane shear device, which enabled us to measure for the 1st time the in-situ undrained shear strength of pelagic sediments in the nodule environment. The possibility of accurately choosing on the seafloor the testing sites by means of a submersible, enable us to achieve this spectacular operation of ground-truthing. The other set of instrumentation is an autonomous equipped frame tethered by a cable. It is a supported rig which can be handled by any customary oceanographic vessel and is designed to penetrate the seafloor up to 2 m with a piezo-cone. |
Texte intégral |
Fichier |
Pages |
Taille |
Accès |
acte-1157.pdf |
13 |
885 KB |
Libre accès |
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