Ocean Scientific International Ltd (OSIL)is now offering a T-bar mini-penetrometer for in-field seabed strength profiling of box core samples.
The T-bar penetrometer measures the resistance of sediment to continuous penetration at a slow steady rate using a cylindrical rod (T-bar) at the end of a perpendicular push rod or thruster and is small enough to fit on to the top of a box corer sample box immediately on its recovery on-deck to allow for on-site sampling on the back of the vessel.
Using axial load, dual axis tilt and friction sleeve sensors the system can provide a real-time display that records penetration length, penetration resistance and inclination from the vertical for every millimeter of penetration at 2cm/second and stores the data for later analysis. The system can be fitted with a 25 cm2 T-bar, 50 cm2 T-bar, or 50 cm2 Ball, depending on soil conditions.
Penetrometer testing is used to characterize the undrained shear strength and residual shear strength profiles of seabed soils, which provides valuable data for the positioning and design of a variety of subsea structures.