Numerical study of rock aggregate materials under various loadings

Zhu, L., Erarslan, N., Williams, D. J., Serati, M. and Ghamgosar, M. (2015). Numerical study of rock aggregate materials under various loadings. In: 49th US Rock Mechanics / Geomechanics Symposium 2015. US Rock Mechanics/Geomechanics Symposium, San Francisco, CA, United States, (681-685). 29 June - 1 July 2015.

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Name Description MIMEType Size Downloads
Author Zhu, L.
Erarslan, N.
Williams, D. J.
Serati, M.
Ghamgosar, M.
Title of paper Numerical study of rock aggregate materials under various loadings
Conference name US Rock Mechanics/Geomechanics Symposium
Conference location San Francisco, CA, United States
Conference dates 29 June - 1 July 2015
Convener American Rock Mechanics Association
Proceedings title 49th US Rock Mechanics / Geomechanics Symposium 2015
Journal name 49th US Rock Mechanics / Geomechanics Symposium 2015
Place of Publication Alexandria, VA, United States
Publisher The American Rock Mechanics Association
Publication Year 2015
Sub-type Fully published paper
ISBN 9781510810518
Volume 1
Start page 681
End page 685
Total pages 5
Language eng
Formatted Abstract/Summary
Cemented and uncemented aggregate materials form the main component of road pavements, and play a key role in pavement behaviour under vehicle-induced cyclic loads. In this paper, the Discrete Element Method (DEM) was used to simulate the response of these aggregate materials under various loading conditions. Initially, aggregates of five different shapes and four different sizes, assembled at a certain volume ratio, were subjected to compression tests under constant confining pressure. The results indicated that: (i) cracks initiate more easily in larger particles and in the angular rocks at sharper corners; (ii) shear cracks occur more frequently than tensile cracks; and (iii) more micro fractures are obtained with increasing the confining pressure. Additionally, four different cyclic loadings were applied to a simulated flexible pavement with a Cement Treated Base (CTB) layer to understand the impact of loading type on pavement behaviour. The results showed that: (i) settlement of the CTB layer increases significantly with increasing the stress amplitude and decreased with increasing vertical loading frequency for sinusoidal vertical loading; and (ii) more settlement occurs in the CTB layer under cyclic moving wheels carrying constant vertical loads than that caused by cyclic moving wheels carrying sinusoidal vertical loads both at the same mean stress.
Q-Index Code E1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Conference Paper
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Created: Sun, 05 Jul 2015, 22:54:02 EST by Mehdi Serati on behalf of School of Civil Engineering