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Erschienen in:
2015 | OriginalPaper | Buchkapitel
Viscous Effects on Granular Mixtures in a Rotating Drum
verfasst von : Miguel Angel Cabrera, Devis Gollin, Roland Kaitna, Wei Wu
Erschienen in: Recent Advances in Modeling Landslides and Debris Flows
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In debris flow research, fine particles are considered to be part of the fluid phase of the flow. Nonetheless the particle-size threshold of this phase is not generally clear and could be dependent on the motion-characteristics of the flow itself. In the present study, rotating drum experiments are employed to investigate the effects of kaolin and silt fractions mixed in a fluid phase over a granular mixture of fine and coarse sand. Eight soil mixtures were prepared and tested at variable rotational velocities and water content. The mixtures are subjected to a constant shear that shifts the tested material and due to the action of gravitational forces a recirculating flow is produced inside the rotating drum. Our experiments found evidence of a solid concentration limit value where a shear-dependent behaviour is developed in the mixtures.