Anisotropy of a Tensorial Bishop’s Coefficient for Wetted Granular Materials
Publication: Journal of Engineering Mechanics
Volume 143, Issue 3
Abstract
The objective of this research is to use grain-scale numerical simulations to analyze the evolution of stress anisotropy exhibited in wetted granular matter. Multiphysical particulate simulations of unsaturated granular materials were conducted to analyze how the interactions of contact force chains and liquid bridges affect macroscopic responses under various suction pressure and loading histories. To study how the formation and rupture of liquid bridges affect the mechanical responses of wetted granular materials, a series of suction-controlled triaxial tests were conducted with two grain assemblies, one composed of large particles of similar sizes, the other composed of a mixture of large particles with significant amount of fines. The results indicate that capillary stresses are anisotropic in both sets of specimens, and that stress anisotropy is more significant in granular assemblies filled with fine particles. A generalized tensorial Bishop’s coefficient is introduced to analyze the connections between microstructural attributes and macroscopic responses. Numerical simulations presented in this paper indicate that the principal values and directions of this Bishop’s coefficient tensor are path dependent.
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Acknowledgments
This research was partially supported by the Earth Materials and Processes program at the US Army Research Office under Grant Contract W911NF-14-1-0658 and Provost’s Grants Program for Junior Faculty Who Contribute to the Diversity Goals of the University at Columbia University. These supports are gratefully acknowledged. The authors also thank the anonymous reviewers for their insightful suggestions and detailed feedback.
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Published In
Journal of Engineering Mechanics
Volume 143 • Issue 3 • March 2017
Copyright
© 2015 American Society of Civil Engineers.
History
Received: Dec 31, 2014
Accepted: Jul 22, 2015
Published online: Sep 11, 2015
Discussion open until: Feb 11, 2016
Published in print: Mar 1, 2017
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