Eur. Phys. J. E (2010) 31: 311-314
https://doi.org/10.1140/epje/i2010-10581-7

Regular Article

Effect of the ratios of diameter of silo to bead on the pressure screening in granular columns

¹ Department of Physics, Beijing Institute of Technology, 100081, Beijing, China
² Institute of Physics, Chinese Academy of Sciences, 100080, Beijing, China

^* e-mail: sujjad2000@yahoo.com
^** e-mail: qfshi123@bit.edu.cn
^*** e-mail: gsun@aphy.iphy.ac.cn

Received: 18 August 2009
Revised: 21 December 2009
Accepted: 22 February 2010
Published online: 23 March 2010

Abstract

We present the apparent mass measurements at the bottom of granular packings for different bead and silo sizes. The redirection parameter K in Janssen theory is found to increase with the ratios of the diameter of the silo to the bead. We attribute this feature to the friction between the beads and the confining wall of silo; it is the role of friction that leads to variations in the shielding of vertical stresses as well as pressure screening.