Interface Shear Tester: University of Dundee

Dr Michael Brown and doctoral researcher Mr Andreas Ziogos, are interested in the development and enhancement of gravity based foundations for marine or tidal stream energy generators (Small et al. 2014 & Ziogos et al. 2014).

Tidal currents may impose significant horizontal forces on submerged energy generators making horizontal sliding capacity more critical than bearing. The seabed in areas of high tidal resource may be rocky and free of sediment and consequently an understanding of the unbonded rock-steel (or rock-concrete) interface frictional properties is crucial in order to achieve efficient foundation design, since friction is the horizontal stabilising resistance of gravity based foundations. Element interface testing of foundation materials is essential and should be conducted for a wide range of materials and normal stress levels in order to allow in depth investigation of the interface shearing behaviour. The conventional direct shearbox is often used for interface testing but due to the arrangement of the equipment it does not lend itself to the testing of two rigid samples against each other. There are also limitations on the amount of normal stress that can be safely applied which is typically limited to 315 kPa for hanging weight systems.


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System Featured: 

GDS Interface Shear Tester