Particle Shape Effects on Packing Density, Stiffness, and Strength: Natural and Crushed Sands
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VIEW THE REPLYPublication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 132, Issue 5
Abstract
The size and shape of soil particles reflect the formation history of the grains. In turn, the macroscale behavior of the soil mass results from particle level interactions which are affected by particle shape. Sphericity, roundness, and smoothness characterize different scales associated with particle shape. New experimental data and results from published studies are gathered into two databases to explore the effects of particle shape on packing density and on the small-to-large strain mechanical properties of sandy soils. In agreement with previous studies, these data confirm that increased angularity or eccentricity produces an increase in and . Furthermore, the data show that increasing particle irregularity causes a decrease in stiffness yet heightened sensitivity to the state of stress; an increase in compressibility under zero-lateral strain loading; an increase in the critical state friction angle ; and an increase in the intercept of the critical state line (there is a weak effect on the slope ). Therefore, particle shape emerges as a significant soil index property that needs to be properly characterized and documented, particularly in clean sands and gravels. The systematic assessment of particle shape will lead to a better understanding of sand behavior.
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Acknowledgments
Support was provided by NSFNSF (Project: The Effect of Internal Scales in Soil Behavior), the Georgia Mining Industry, The Goizueta Foundation, and the Smart Infra-Structure Technology Center (SISTeC) under KOSEF.KOSEF The writers are grateful to the reviewers for their detailed comments.
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Published In
Journal of Geotechnical and Geoenvironmental Engineering
Volume 132 • Issue 5 • May 2006
Pages: 591 - 602
Copyright
© 2006 ASCE.
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Received: Sep 9, 2004
Accepted: Sep 29, 2005
Published online: May 1, 2006
Published in print: May 2006
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