Mesures geotechniques par grand fond

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.
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Cochonat Pierre, Dansy G, Leduc Bernard, Meunier Jacques, Harmegnies Francois, Floury L (1990). Mesures geotechniques par grand fond. Actes de colloques. Ifremer. Brest [ACTES COLLOQ. IFREMER.]. 1991.