Effect of Volume Fraction on Granular Aavalanche Dynamics

dc.contributor.author Gravish, Nick
dc.contributor.author Goldman, Daniel I.
dc.contributor.corporatename Georgia Institute of Technology. School of Physics en_US
dc.contributor.corporatename Georgia Institute of Technology. Institute for Robotics and Intelligent Machines en_US
dc.date.accessioned 2015-05-08T17:06:22Z
dc.date.available 2015-05-08T17:06:22Z
dc.date.issued 2014
dc.description © 2014 American Physical Society en_US
dc.description DOI: 10.1103/PhysRevE.90.032202
dc.description.abstract We study the evolution and failure of a granular slope as a function of prepared volume fraction, φ0. We rotated an initially horizontal layer of granular material (0.3-mm-diam glass spheres) to a 45◦ angle while we monitor the motion of grains from the side and top with high-speed video cameras. The dynamics of grain motion during the tilt process depended sensitively on φ0∈ [0.58–0.63] and differed above or below the granular critical state, φc, defined as the onset of dilation as a function of increasing volume fraction. For φ0−φc < 0, slopes experienced short, rapid, precursor compaction events prior to the onset of a sustained avalanche. Precursor compaction events began at an initial angle θ0 = 7.7 ± 1.4◦ and occurred intermittently prior to the onset of an avalanche. Avalanches occurred at the maximal slope angle θm =28.5 ± 1.0◦. Granular material at φ0 − φc > 0 did not experience precursor compaction prior to avalanche flow, and instead experienced a single dilational motion at θ0 = 32.1 ± 1.5◦ prior to the onset of an avalanche at θm = 35.9 ± 0.7◦. Both θ0 and θm increased with φ0 and approached the same value in the limit of random close packing. The angle at which avalanching grains came to rest, θR = 22 ± 2◦, was independent of φ0. From side-view high-speed video, we measured the velocity field of intermittent and avalanching flow. We found that flow direction, depth, and duration were affected by φ0, with φ0 − φc < 0 precursor flow extending deeper into the granular bed and occurring more rapidly than precursor flow at φ0 − φc > 0. Our study elucidates how initial conditions—including volume fraction—are important determinants of granular slope stability and the onset of avalanches. en_US
dc.embargo.terms null en_US
dc.identifier.citation Gravish, N. and Goldman, D. I. (2014). “Effect of Volume Fraction on Granular Avalanche Dynamics”. Physical Review E, 90(3), 032202 (September 2014). en_US
dc.identifier.doi 10.1103/PhysRevE.90.032202
dc.identifier.eissn 1550-2376 (Online)
dc.identifier.issn 1539-3755 (Print)
dc.identifier.uri http://hdl.handle.net/1853/53341
dc.language.iso en_US en_US
dc.publisher Georgia Institute of Technology en_US
dc.publisher.original American Physical Society
dc.subject Avalanche flow en_US
dc.subject Grain motion en_US
dc.subject Granular material en_US
dc.subject Volume fraction en_US
dc.title Effect of Volume Fraction on Granular Aavalanche Dynamics en_US
dc.type Text
dc.type.genre Article
dspace.entity.type Publication
local.contributor.author Goldman, Daniel I.
local.contributor.corporatename College of Sciences
local.contributor.corporatename School of Physics
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relation.isOrgUnitOfPublication 2ba39017-11f1-40f4-9bc5-66f17b8f1539
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