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Abstract

A "Deep Ocean Research Apparatus" (DORA) seabed machine has been conceptually designed and prototypes of principal subsystems built and tested by four DORA Project partners. The DORA is designed to operate in 6000 m of water and drive a string of test rods and a piezocone about 50 m into soft soil. Partner responsibility was Fugro for project management and the penetration apparatus; ISMES for data acquisition and control; Laboratorium voor Grondmechanica for the piezocone probe and its sensors; and Marine Structure Consultants for the mission profile and DORA handling requirements. The DORA will have a maximum thrust of 60 kN. The probe will measure cone resistance, sleeve friction, pore pressure and inclination. Stability on the seabed will be assisted by using a combination of polyester and polypropylene - nylon (double) braided rope. A continuous wheel drive subsystem will drive the test rods. Gelled or lead acid batteries can power a hydraulic powerpack. Acoustic data transmission will be used. Software for data processing automation has been tested with simulation of all input channels. Successful operation of subsystem prototypes indicates that a DORA can be constructed at any future time for use on fundamental or applied deep ocean science and seafloor engineering investigations by industry, government and universities.

Additional information

Authors: THE DORA PARTNERS, LABORATORIUM VOOR GRONDMECHANICA, DELFT MARINE STRUCTURE CONSULTANTS (MSC) B.V., HARDINXVELD-GIESENDAM (THE NETHERLANDS);FUGRO BV, LABORATORIUM VOOR GRONDMECHANICA, DELFT MARINE STRUCTURE CONSULTANTS (MSC) B.V., HARDINXVELD-GIESENDAM (THE NETHERLANDS);ISMES SPA LABORATORIUM VOOR GRONDMECHANICA, DELFT MARINE STRUCTURE CONSULTANTS (MSC) B.V., HARDINXVELD-GIESENDAM (THE NETHERLANDS), LABORATORIUM VOOR GRONDMECHANICA, DELFT MARINE STRUCTURE CONSULTANTS (MSC) B.V., HARDINXVELD-GIESENDAM (THE NETHERLANDS)
Bibliographic Reference: EUR 10601 EN (1986) MF, 204 P., BFR 450, BLOW-UP COPY BFR 1000, EUROFFICE, LUXEMBOURG, POB 1003
Availability: Can be ordered online
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