0
research-article

Interaction model for ?shelled-particles? and small-strain modulus of granular materials

[+] Author and Article Information
Shunhua Zhou

Professor, Key Laboratory of Road and Traffic Engineering of the State Ministry of Education, Tongji University, Shanghai, 200092, China
zhoushh@tongji.edu.cn

Peijun Guo

Professor, Key Laboratory of Road and Traffic Engineering of the State Ministry of Education, Tongji University, Shanghai, 200092, China; Professor, on research leave from Department of Civil Engineering, McMaster University, Hamilton, Ontario, Canada L8S 4L7
guop@mcmaster.ca

Dieter. F. E. Stolle

Professor, Department of Civil Engineering, McMaster University, Hamilton, Ontario, Canada L8S 4L7
stolle@mcmaster.ca

1Corresponding author.

ASME doi:10.1115/1.4040408 History: Received March 25, 2018; Revised May 22, 2018

Abstract

The elastic modulus of a granular assembly composed of spherical particles in Hertzian contact usually has a scaling law with the mean effective pressure p as K~G~p^(1/3) . Laboratory test results, however, reveal that the value of the exponent is generally around 1/2 for most sands and gravels, but it is much higher for reclaimed asphalt concrete composed of particles coated by a thin layer asphalt binder and even approaching unity for aggregates consisting of crushed stone. By assuming that a particle is coated with a thin soft deteriorated layer, an energy-based simple approach is proposed for thin-coating contact problems. Based on the features of the surface layer, the normal contact stiffness between two spheres varies with the contact force following kn~Fn^m and m=[1/3,1], with m=1/3 for Hertzian contact, m=1/3 for soft thin-coating contact, m=2/3 for incompressible soft thin-coating, and m=1 for spheres with rough surfaces. Correspondingly, the elastic modulus of a random granular packing is proportional to p^m with m=[1/3,1].

Copyright (c) 2018 by ASME
Your Session has timed out. Please sign back in to continue.

References

Figures

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In