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Provedor de dados:  ArchiMer
País:  France
Título:  Mesures geotechniques par grand fond
Autores:  Cochonat, Pierre
Dansy, G
Leduc, Bernard
Meunier, Jacques
Harmegnies, Francois
Floury, L
Data:  1990-12
Ano:  1990
Palavras-chave:  Submarine cables
Deep sea mining
Offshore equipment
Sedimentary structures
Ferromanganese nodules
Marine technology
Ocean floor
Deep water
Resumo:  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.
Tipo:  Text
Idioma:  Francês
Editor:  Actes de colloques. Ifremer. Brest [ACTES COLLOQ. IFREMER.]. 1991
Formato:  application/pdf

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