The influence of particle surface roughness on elastic stiffness and dynamic response
File(s)
Accepted version
Accepted version
Author(s)
Otsubo, M
O'Sullivan, C
Hanley, KJ
Sim, WW
Type
Journal Article
Abstract
Discrete-element method (DEM) simulations of planar wave propagation are used to examine the effect of particle surface roughness on the stiffness and dynamic response of granular materials. A new contact model that considers particle surface roughness is implemented in the DEM simulations. Face-centred cubic lattice packings and random configurations are used; uniform spheres are considered in both cases to isolate fabric and contact model effects from inertia effects. For the range of values considered here surface roughness caused a significant reduction in stiffness, particularly at lower confining stresses. The simulations confirm that surface roughness effects can at least partially explain the value of the exponent in the relationship between stiffness and mean confining stress for an assembly of spherical particles. Frequency domain analyses showed that the maximum frequency transmitted through the sample is reduced when surface roughness is considered. The assumption of homogeneity of stress and contacts in analytical micromechanical models is shown to lead to an overestimation of stiffness.
Date Issued
2017-04-03
Date Acceptance
2016-10-13
Citation
GEOTECHNIQUE, 2017, 67 (5), pp.452-459
ISSN
0016-8505
Publisher
ICE PUBLISHING
Start Page
452
End Page
459
Journal / Book Title
GEOTECHNIQUE
Volume
67
Issue
5
Copyright Statement
© 2017 ICE Publishing, all rights reserved. Original article available at https://dx.doi.org/10.1680/jgeot.16.P.050. Permission is granted by ICE Publishing to print one copy for personal use. Any other use of these PDF files is subject to reprint fees.
Identifier
http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000398585700007&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
Subjects
Science & Technology
Technology
Engineering, Geological
Engineering
discrete-element modelling
dynamics
elasticity
stiffness
waves & wave loading
COARSE-GRAINED SOILS
GRANULAR MATERIAL
SMALL STRAINS
BEHAVIOR
CONTACT
Geological & Geomatics Engineering
0905 Civil Engineering
Publication Status
Published