Contact stiffness affecting discrete element modelling of unbound aggregate granular assemblies

Hai Huang, E. Tutumluer, Y. M.A. Hashash, J. Ghaboussi

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

This paper describes a preliminary study undertaken at the University of Illinois to investigate the impact of contact stiffness properties on aggregate assembly strength. An aggregate particle imaging based Discrete Element Modeling (DEM) methodology was employed to study the effects of normal and shear contact stiffnesses. Using the results of laboratory direct shear box tests on actual aggregate samples, direct shear box DEM simulations were calibrated to identify the effects of different contact stiffness combinations. It was found that as the normal to shear contact stiffness ratio increased, the shear strength of the aggregate assembly also increased. Further, the same stiffness ratio captured the shear behaviour at three different normal stress levels thus validating the DEM simulation results.

Original languageEnglish (US)
Title of host publicationAdvances in Transportation Geotechnics - Proceedings of the 1st International Conference on Transportation Geotechnics
Pages167-172
Number of pages6
StatePublished - Dec 1 2008
Event1st International Conference on Transportation Geotechnics, ICTG-1 - Nottingham, United Kingdom
Duration: Aug 25 2008Aug 27 2008

Publication series

NameAdvances in Transportation Geotechnics - Proceedings of the 1st International Conference on Transportation Geotechnics

Other

Other1st International Conference on Transportation Geotechnics, ICTG-1
CountryUnited Kingdom
CityNottingham
Period8/25/088/27/08

Fingerprint

stiffness
Stiffness
contact
modeling
simulation
Computer simulation
Shear strength
shear strength
methodology
Imaging techniques
effect

All Science Journal Classification (ASJC) codes

  • Geotechnical Engineering and Engineering Geology
  • Transportation

Cite this

Huang, H., Tutumluer, E., Hashash, Y. M. A., & Ghaboussi, J. (2008). Contact stiffness affecting discrete element modelling of unbound aggregate granular assemblies. In Advances in Transportation Geotechnics - Proceedings of the 1st International Conference on Transportation Geotechnics (pp. 167-172). (Advances in Transportation Geotechnics - Proceedings of the 1st International Conference on Transportation Geotechnics).
Huang, Hai ; Tutumluer, E. ; Hashash, Y. M.A. ; Ghaboussi, J. / Contact stiffness affecting discrete element modelling of unbound aggregate granular assemblies. Advances in Transportation Geotechnics - Proceedings of the 1st International Conference on Transportation Geotechnics. 2008. pp. 167-172 (Advances in Transportation Geotechnics - Proceedings of the 1st International Conference on Transportation Geotechnics).
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Huang, H, Tutumluer, E, Hashash, YMA & Ghaboussi, J 2008, Contact stiffness affecting discrete element modelling of unbound aggregate granular assemblies. in Advances in Transportation Geotechnics - Proceedings of the 1st International Conference on Transportation Geotechnics. Advances in Transportation Geotechnics - Proceedings of the 1st International Conference on Transportation Geotechnics, pp. 167-172, 1st International Conference on Transportation Geotechnics, ICTG-1, Nottingham, United Kingdom, 8/25/08.

Contact stiffness affecting discrete element modelling of unbound aggregate granular assemblies. / Huang, Hai; Tutumluer, E.; Hashash, Y. M.A.; Ghaboussi, J.

Advances in Transportation Geotechnics - Proceedings of the 1st International Conference on Transportation Geotechnics. 2008. p. 167-172 (Advances in Transportation Geotechnics - Proceedings of the 1st International Conference on Transportation Geotechnics).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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AB - This paper describes a preliminary study undertaken at the University of Illinois to investigate the impact of contact stiffness properties on aggregate assembly strength. An aggregate particle imaging based Discrete Element Modeling (DEM) methodology was employed to study the effects of normal and shear contact stiffnesses. Using the results of laboratory direct shear box tests on actual aggregate samples, direct shear box DEM simulations were calibrated to identify the effects of different contact stiffness combinations. It was found that as the normal to shear contact stiffness ratio increased, the shear strength of the aggregate assembly also increased. Further, the same stiffness ratio captured the shear behaviour at three different normal stress levels thus validating the DEM simulation results.

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Huang H, Tutumluer E, Hashash YMA, Ghaboussi J. Contact stiffness affecting discrete element modelling of unbound aggregate granular assemblies. In Advances in Transportation Geotechnics - Proceedings of the 1st International Conference on Transportation Geotechnics. 2008. p. 167-172. (Advances in Transportation Geotechnics - Proceedings of the 1st International Conference on Transportation Geotechnics).