Effect of Particle Shape on Stress-Dilatancy Responses of Medium-Dense Sands
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Volume 145, Issue 2
Abstract
The effect of particle shape on the strength, dilatancy, and stress-dilatancy relationship was systematically investigated through a series of drained triaxial compression tests on sands mixed with angular and rounded glass beads of different proportions (0%, 25%, 50%, 75%, and 100%). A distinct overall regularity parameter was used to define the particle shape of these mixtures, which ranged from 0.844 to 0.971. The test results showed that all of the samples at an initial relative density of 0.6 exhibited strain-softening and volume-expansion behavior. It was found that the peak-state deviatoric stress, peak-state axial strain, and peak-state friction angle at a given confining pressure decreased with increasing overall regularity. The maximum differences in the peak-state deviator stress, peak-state axial strain, peak-state friction angle, excess friction angle, and maximum dilation angle due to changes in particle shape could be as much as 0.61 MPa, 5.4%, 8.6, 1.5, and 3° at a given confining pressure of 0.4 MPa. In addition, it was found that the slope of the relationship between the peak-state friction angle and maximum dilation angle was independent of the particle shape, whereas the intercept (i.e., the critical-state friction angle) was significantly influenced by the particle shape. A stress-dilatancy equation incorporating the effect of overall regularity was proposed and provided a good estimate of the observed response accounting for the different particle shapes investigated.
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Acknowledgments
The authors are grateful to Professor John McCartney for helpful comments provided during preparation of this manuscript. The authors would like to acknowledge the financial support from the 111 Project (Grant No. B13024), the National Science Foundation of China (Grant Nos. 51509024, 51678094, and 51578096), the Fundamental Research Funds for the Central Universities (Grant No. 106112017CDJQJ208848), and Special Financial Grant from the China Postdoctoral Science Foundation (Grant No. 2017T100681). T. Matthew Evans was supported by the National Science Foundation (NSF) (Grant No. CMMI-1538460) during the course of this work. This support is gratefully acknowledged.
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Journal of Geotechnical and Geoenvironmental Engineering
Volume 145 • Issue 2 • February 2019
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Received: Dec 10, 2017
Accepted: Jul 18, 2018
Published online: Nov 21, 2018
Published in print: Feb 1, 2019
Discussion open until: Apr 21, 2019
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