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Mesures geotechniques par grand fond
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.
Auteurs du document :
Cochonat, Pierre, Dansy, G, Leduc, Bernard, Meunier, Jacques, Harmegnies, Francois, Floury, LObtenir le document :
Actes de colloques. Ifremer. Brest [ACTES COLLOQ. IFREMER.]. 1991Mots clés :
Submarine cables, Deep sea mining, Offshore equipment, Geotechnology, Submersibles, Sedimentary structures, Sedimentology, Ferromanganese nodules, Instability, Marine technology, Sediments, Ocean floor, Deep waterThème (issu du Text Mining) :
MESURES ET INSTRUMENTATION, MILIEU NATURELDate :
1990-12Format :
text/xmlLangue :
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Ce portail, créé et géré par l'Office International de l'Eau (OiEAU), est géré avec l'appui de l’Office français de la biodiversité (OFB)