Influence of Particle Morphology on 3D Kinematic Behavior and Strain Localization of Sheared Sand
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 143, Issue 2
Abstract
The constitutive behavior of sheared sand is highly influenced by particle morphology, gradation, mineralogy, specimen density, loading condition, stress path, and boundary conditions. The current literature lacks a three-dimensional (3D) systematic experimental study that investigates the influence of particle morphology, confining pressure, and specimen density on the failure mode of sheared sand. In this paper, surface texture, roundness, and sphericity of three uniform sands and glass beads with similar grain size were quantified by using 3D images of particles. In situ nondestructive 3D synchrotron microcomputed tomography (SMT) was used to monitor the deformation of medium-dense and very dense dry sand specimens that were tested under axisymmetric triaxial loading condition at 15 and 400 kPa confining pressures. The particles were identified and tracked in 3D as shearing progressed within the specimens, and maps of incremental particle translation and rotation were developed and used to uncover the relationship between particle morphology, specimen density, and confining pressure on the deformation and failure mode of sheared sand. This paper discusses the relationship between the failure mode and particle morphology, specimen density, and confining pressure.
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Acknowledgments
This material is based on work supported by the National Science Foundation (NSF) under Grant No. CMMI-1266230. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the authors and do not necessarily reflect the views of the NSF. The SMT images presented in this paper were collected by using the X-Ray Operations and Research Beamline Station 13-BMD at Argonne Photon Source, a DOE Office of Science User Facility operated for the DOE Office of Science by Argonne National Laboratory under Contract No. DE-AC02-06CH11357. The authors acknowledge the support of GeoSoilEnviroCARS (Sector 13), which is supported by the National Science Foundation—Earth Sciences (EAR-1128799), and the Department of Energy, Geosciences (DE-FG02-94ER14466). The authors thank Dr. Mark Rivers of APS for his help in performing the SMT scans.
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Journal of Geotechnical and Geoenvironmental Engineering
Volume 143 • Issue 2 • February 2017
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© 2016 American Society of Civil Engineers.
History
Received: Nov 16, 2015
Accepted: Jun 22, 2016
Published online: Aug 22, 2016
Discussion open until: Jan 22, 2017
Published in print: Feb 1, 2017
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