FN Archimer Export Format
PT C
TI Mesures geotechniques par grand fond
OT Deep water geotechnical testing.
BT 
AF COCHONAT, Pierre
   DANSY, G
   LEDUC, Bernard
   MEUNIER, Jacques
   HARMEGNIES, Francois
   FLOURY, L
AS 1:;2:;3:;4:;5:;6:;
FF 1:PDG-DPCP;2:;3:PDG-TMSI-AS;4:PDG-DOP-DCB-RDT;5:PDG-DOP-DCB-GM;6:;
SI SIEGE
   BREST
SE PDG-DPCP
   PDG-TMSI-AS
   PDG-DOP-DCB-RDT
   PDG-DOP-DCB-GM
UR https://archimer.ifremer.fr/doc/1990/acte-1157.pdf
LA French
DT Proceedings paper
DE ;Submarine cables;Deep sea mining;Offshore equipment;Geotechnology;Submersibles;Sedimentary structures;Sedimentology;Ferromanganese nodules;Instability;Marine technology;Sediments;Ocean floor;Deep water
AB 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. 
PY 1990
PD DEC
CT Actes de colloques. Ifremer. Brest [ACTES COLLOQ. IFREMER.]. 1991
ID 1157
ER

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