Geomechanics and geotechnical engineering paper
Rognon, P, Miller, T, Einav, I 2014, 'Constitutive behaviour of flowing granular soils near walls', in ST Smith (ed.), 23rd Australasian Conference on the Mechanics of Structures and Materials (ACMSM23), vol. II, Byron Bay, NSW, 9-12 December, Southern Cross University, Lismore, NSW, pp. 751-756. ISBN: 9780994152008.
We investigate the effect of bounding walls on the ability of granular soils to flow. We present a set of experimental and numerical granular flows using a novel Stadium Shear Device and discrete element method simulations. Our focus is on the simple configuration of plane shear flow of 2D grains between two parallel walls, while we analyse the time-averaged velocity profiles within the flows. Simulations and experiments consistently show that the visco-plastic constitutive behaviour of such granular flows is strongly affected by the presence of walls over relatively large distances. Near the walls, the material appears to flow more easily, forming a layer where the shear rate is up to 100% higher than the rate far away from the wall. This effect of walls is important for geotechnical applications such as foundation design and landslide run-out prediction, where a comprehensive understanding of the mechanical interaction between granular-soils and structures is crucial.