| Registro completo |
| Provedor de dados: |
ArchiMer
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| País: |
France
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| Título: |
Mesures geotechniques par grand fond
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| Autores: |
Cochonat, Pierre
Dansy, G
Leduc, Bernard
Meunier, Jacques
Harmegnies, Francois
Floury, L
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| Data: |
1990-12
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| Ano: |
1990
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| Palavras-chave: |
Submarine cables
Deep sea mining
Offshore equipment
Geotechnology
Submersibles
Sedimentary structures
Sedimentology
Ferromanganese nodules
Instability
Marine technology
Sediments
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.
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| Tipo: |
Text
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| Idioma: |
Francês
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| Identificador: |
http://archimer.ifremer.fr/doc/1990/acte-1157.pdf
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| Editor: |
Actes de colloques. Ifremer. Brest [ACTES COLLOQ. IFREMER.]. 1991
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| Relação: |
http://archimer.ifremer.fr/doc/00000/1157/
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| Formato: |
application/pdf
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