Friction and Dilatancy Angles of Granular Soils Incorporating Effects of Shearing Modes
Publication: International Journal of Geomechanics
Volume 18, Issue 11
Abstract
The strength–dilatancy relationship, which is significantly influenced by the shearing mode, is of great importance in modeling evolution of the mobilized strength and predicting deformations of granular soils. In this paper, the effects of the shearing mode on the strength–dilatancy relation were investigated by performing the multiaxial tests on gravelly soils. It was interestingly found that the gradient of the fitting line for the relationship between the peak–failure friction angle and maximum dilatancy angle increased with increasing the intermediate principal stress ratio b. In particular, for b = 0, the gradient of the fitting line was 0.44 (which was smaller than the Bolton dilatancy index of 0.48). In addition, a strength–dilatancy equation incorporating the effects of shearing mode was proposed for this gravel soil. Thereafter, a general equation between peak friction–failure angle and maximum dilatancy was obtained by using experimental data from the literature and current work for different shearing modes. The two equations were then validated by other independent test data on sands and gravels. It was observed that the general strength–dilatancy equation could well capture the strength–dilatancy relationships on various granular soils, including sands and gravel under different shearing modes.
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Acknowledgments
The authors are most thankful for the editors and reviewers for giving useful comments to improve this note. The authors also appreciate the assistance from Prof. C. S. Desai at University of Arizona for addressing the reviewers’ comments as well as revising this technical note. Finally, the authors would like to acknowledge the financial support from the 111 Project (Grant B13024), the National Science Foundation of China (Grants 51509024 and 51678094), the Fundamental Research Funds for the Central Universities (Grant 106112017CDJQJ208848), and Special Financial Grant from the China Postdoctoral Science Foundation (Grant 2017T100681).
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Published In
International Journal of Geomechanics
Volume 18 • Issue 11 • November 2018
Copyright
© 2018 American Society of Civil Engineers.
History
Received: Oct 11, 2016
Accepted: May 21, 2018
Published online: Aug 28, 2018
Published in print: Nov 1, 2018
Discussion open until: Jan 28, 2019
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