Dilatancy Equation for Rockfill Materials under Three-Dimensional Stress Conditions
Publication: International Journal of Geomechanics
Volume 19, Issue 5
Abstract
The intermediate principal stress ratio b has a significant influence on the dilatancy behaviors of rockfill materials. The dilatancy equation is defined as a function of the dilatancy dg and the stress ratio η. To investigate the applicability of a dilatancy equation when considering the influence of the b-value, a series of true triaxial tests including constant b-value (CB) tests and plane strain tests were performed. The results of the CB tests indicated that the stress ratio at the critical state, Mc, remarkably decreases with increasing b-value. By comparing the results with three widely used interpolation functions, a newly proposed interpolation function was suggested to express the relationships between the material constants of the dilatancy equation, i.e., Mc, A, and C, and the Lode angle θ (b-value). Additionally, the predictions of the dilatancy equation considering b-value agreed well with the rearranged test data of the constant-b and plane strain rockfill specimens. As a result, the dilatancy equation and the proposed interpolation function are believed to well express the dilatancy behaviors of rockfill materials under three-dimensional stress conditions.
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Acknowledgments
The authors gratefully acknowledge the financial support from the National Key R&D Program of China (2017YFC0404801), research Grant 51479052 from the Natural Science Foundation of China, the Fundamental Research Funds for the Central Universities (2018B42414), and research Grant GG201705 from the Key Technologies R&D Program of the Henan water conservancy.
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Published In
International Journal of Geomechanics
Volume 19 • Issue 5 • May 2019
Copyright
© 2019 American Society of Civil Engineers.
History
Received: Jun 5, 2018
Accepted: Oct 26, 2018
Published online: Feb 25, 2019
Published in print: May 1, 2019
Discussion open until: Jul 25, 2019
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