Giant piston corers were introduced to the marine geotechnical site investigations market towards the end of the nineties. Such corers are also used for scientific studies by research institutes as Institut Français de Recherche pour l’Exploitation de la Mer (IFREMER). Cores were observed to show distortion or mismatches between core length and the position of the sample in the soil.

The instrumentation of corer provides valuable information on the behaviour of the corer. The instrumentation also allows the correction of sample length to its true penetration.

This paper:

• Describes the instrumentation now permanently mounted on the STACOR® giant piston corer

• Presents the installation of sensors,

• Describes the data interpretation,

• Provides some recommendations for extending this monitoring to other large gravity corers.

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