Janssen effect and the stability of quasi 2-D sandpiles

We present the results of three dimensional molecular dynamics study of global normal stresses in quasi two dimensional sandpiles formed by pouring mono dispersed cohesionless spherical grains into a vertical granular Hele-Shaw cell. We observe Janssen effect which is the phenomenon of pressure satu...

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Published in:arXiv.org 2010-07
Main Authors: Ebrahimi, Fatemeh, Azizpour, Tahereh, Maleki, Hamed
Format: Article
Language:English
Subjects:
Coefficient of friction
Dependence
Dimensional stability
Grains
Molecular dynamics
Parameters
Stresses
Thickness
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Azizpour, Tahereh
Maleki, Hamed
description We present the results of three dimensional molecular dynamics study of global normal stresses in quasi two dimensional sandpiles formed by pouring mono dispersed cohesionless spherical grains into a vertical granular Hele-Shaw cell. We observe 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 \(\kappa\) is a function of the cell thickness. Dependence of global normal stresses as well as \(\kappa\) on the friction coefficients between the grains (\(\mu_p\)) and with walls (\(\mu_w\)) are also studied. The results show that in the range of our simulations \(\kappa\) usually increases with wall-grain friction coefficient. Meanwhile by increasing \(\mu_p\) while the other system parameters are fixed, we witness a gradual increase in \(\kappa\) to a parameter dependent maximal value.
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subjects Coefficient of friction
Dependence
Dimensional stability
Grains
Molecular dynamics
Parameters
Stresses
Thickness
title Janssen effect and the stability of quasi 2-D sandpiles
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