Interparticle Contact Behavior and Wave Propagation
Publication: Journal of Geotechnical Engineering
Volume 122, Issue 10
Abstract
The low-strain stiffness and energy dissipation in particulate materials is strongly determined by the behavior of contacts. This paper presents results of a test program designed to study the effect of contact response on the propagation of waves. Wave velocity and attenuation were measured during isotropic loading using a resonant column device at shear strains varying from γ= 10 −5 to γ= 10 −6 . Elastic, viscoplastic and brittle contact behaviors were studied with steel spheres, lead shot, and silica-kaolinite pellets. All measured velocity-stress exponents were b /2 >≈ 1/6, which is the theoretical value for spherical contacts. High-tolerance steel spheres approximated this value. Contact crushing showed the highest exponent. Theoretical analyses confirmed that several phenomena conduce to a velocity-stress exponent b /2 = 0.25: buckling of particle chains and increase in coordination number, elastoplastic behavior, and cone-plane contacts. Load and unload data for viscoplastic lead shot showed that contact deformation is the governing parameter for low-strain stiffness, regardless whether the causing mechanism was elastic deformation, creep, or yield. All measured damping-stress exponents were between κ=−0.45 for steel and κ=−0.11 for the brittle pellets, while the theoretical value for frictional Mindlin contacts is κ=−2/3. Damping showed higher sensitivity than velocity to stress and time.
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Published In
Journal of Geotechnical Engineering
Volume 122 • Issue 10 • October 1996
Pages: 831 - 839
Copyright
Copyright © 1996 American Society of Civil Engineers.
History
Published online: Oct 1, 1996
Published in print: Oct 1996
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