FRICTION AT THE GRAIN-SCALE: THE ROLE OF INTER-PARTICLE FRICTION IN GRANULAR MEDIA AND ITS EFFECT ON GRAIN-AND MACRO-SCALE BED BEHAVIOUR

Jack MOSS, Romeo GLOVNEA

Abstract


In these experimental lab-based tests, ‘dry’ and ‘wet’ ideal granular beds, consisting of quasi 2D polydisperse discs, are harmonically compressed via a moving sidewall and their responses captured via high-speed imaging. First, the behaviour of a ‘dry’ granular bed is examined, and then a thin layer of glycerol is spread onto the edges of each individual disc for the behaviour of a ‘wet’ granular bed to be examined. The individual behaviour of these beds is analysed and compared. In general, the reduced friction in the wet granular bed leads to more sliding and less rolling at the grain-scale, which in turn produces greater ease of macro-scale bed deformation. These results are used to discuss the role of inter particle friction in granular behaviour.

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