Laboratory Analyses of Noncoaxiality and Anisotropy of Spherical Granular Media under True Triaxial State
Publication: International Journal of Geomechanics
Volume 23, Issue 9
Abstract
Anisotropy of the soil is responsible for its noncoaxial response. In simple shear and hollow cylindrical torsional shear tests, considerable noncoaxial responses were detected as a result of the stress-induced anisotropy caused by the rotation of the principal stress axis, while true triaxial tests on the noncoaxial and anisotropic response of perfectly spherical particles have seldom been reported. In consideration of the influence of the three principal stress orientations, true triaxial tests were conducted on uniformly sized spherical glass balls using the stress path of fixed-axis shear with constant values of p′ and b in the deviatoric plane. Samples with inherent anisotropy were prepared to study the evolution of noncoaxiality and anisotropy as a result of the loading process across the entire deviatoric plane. Test results indicate that the glass bead samples exhibit minor deformation and strength anisotropy in various sections of the deviatoric plane. The noncoaxial behaviors exhibit apparent orientation-dependent and b-dependent properties. This study would provide a valuable reference for granular materials with different shapes and gradations in nature that are subjected to true triaxial stress conditions.
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Acknowledgments
This research was funded by the National Natural Science Foundation of China (Grant Nos. 12162028 and 51669027), the project of Leading Talents of Science and Technology Innovation of Ningxia (Grant No. KJT2019001), and the Technology Innovation Team-Ningxia Hui Autonomous Region (Innovation Team-Multi-scale Mechanics and Engineering Applications). Their support is gratefully acknowledged.
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Published In
International Journal of Geomechanics
Volume 23 • Issue 9 • September 2023
Copyright
© 2023 American Society of Civil Engineers.
History
Received: Aug 11, 2022
Accepted: Apr 3, 2023
Published online: Jul 5, 2023
Published in print: Sep 1, 2023
Discussion open until: Dec 5, 2023
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