Janssen effect and the stability of quasi-two-dimensional sandpiles

We present the results of three-dimensional discrete element simulations of global normal stresses in quasi-two-dimensional sandpiles formed by pouring monodispersed cohesionless spherical grains into a vertical granular Hele-Shaw cell. We observe the Janssen effect which is the phenomenon of pressu...

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Published in:Physical review. E, Statistical, nonlinear, and soft matter physics Statistical, nonlinear, and soft matter physics, 2010-09, Vol.82 (3 Pt 1), p.031302-031302, Article 031302
Main Authors: Ebrahimi, Fatemeh, Azizpour, Tahereh, Maleki, Hamed
Format: Article
Language:English
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Summary:We present the results of three-dimensional discrete element simulations of global normal stresses in quasi-two-dimensional sandpiles formed by pouring monodispersed cohesionless spherical grains into a vertical granular Hele-Shaw cell. We observe the Janssen effect which is the phenomenon of pressure saturation at the bottom of the container. Simulation of cells with different thicknesses shows that the Janssen coefficient κ is a function of the cell thickness. Dependence of global normal stresses as well as κ on the friction coefficients between the grains (μ(p)) and with walls (μ(w)) are also studied. The results show that in the range of our simulations κ usually increases with the wall-grain friction coefficient. Meanwhile by increasing μ(p) while the other system parameters are fixed, we witness a gradual increase in κ to a parameter dependent maximal value.
ISSN:1539-3755
1550-2376
DOI:10.1103/PhysRevE.82.031302