Strength and Dilatancy Behaviors of Dense Modeled Rockfill Material in General Stress Space
Publication: International Journal of Geomechanics
Volume 16, Issue 5
Abstract
The strength and dilatancy behaviors of modeled dense rockfill material were systematically investigated through a series of true triaxial compression tests at different minor principal stress and intermediate principal stress ratios. It was found that the intermediate principal stress ratio had great influence on the critical-state friction angle, peak-state friction angle, and maximum dilatancy of the modeled rockfill material. Both the critical-state and peak-state friction angles at a given confining pressure first increased and then decreased with an increase in the intermediate principal stress ratio. An increase in the minor principal stress led to a decrease in both the critical-state and peak-state friction angles at a given intermediate principal stress ratio. The maximum dilatancy decreased with an increase in the minor principal stress or the intermediate principal stress ratio. It was also found that the intermediate principal stress ratio significantly affected the relationship between the peak-state friction angle and maximum dilatancy. An adapted stress–dilatancy equation (incorporating a state index and a function of the intermediate principal stress ratio) could be used to capture the stress–dilatancy behaviors of modeled rockfill materials at different intermediate principal stress ratios.
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Acknowledgments
The authors acknowledge the financial support from the 111 Project (Grant No. B13024), the National Natural Science Foundation of China (Grant No. 51509024), and the Fundamental Research Funds for the Central Universities (Grant No. 106112015CDJXY200008).
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Published In
International Journal of Geomechanics
Volume 16 • Issue 5 • October 2016
Copyright
© 2016 American Society of Civil Engineers.
History
Received: Jan 9, 2014
Accepted: Dec 18, 2015
Published online: Feb 8, 2016
Discussion open until: Jul 8, 2016
Published in print: Oct 1, 2016
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