DOI: 10.1002/2014GL061981
论文题名: Force chains as the link between particle and bulk friction angles in granular material
作者: Booth A.M. ; Hurley R. ; Lamb M.P. ; Andrade J.E.
刊名: Geophysical Research Letters
ISSN: 0094-9476
EISSN: 1944-9207
出版年: 2014
卷: 41, 期: 24 起始页码: 8862
结束页码: 8869
语种: 英语
英文关键词: force chains
; friction angle
; granular mechanics
; mass failure
; sediment transport
Scopus关键词: Chains
; Failure (mechanical)
; Friction
; Particles (particulate matter)
; Sediment transport
; Sedimentation
; Sediments
; Discrete element modeling
; Force chains
; Friction angles
; Granular mechanics
; Mass failures
; Mohr-Coulomb failure criterion
; Probabilistic modeling
; Sediment transport process
; Tribology
; discrete element method
; friction
; grain size
; granular medium
; sediment transport
; stability analysis
英文摘要: From sediment transport in rivers to landslides, predictions of granular motion rely on a Mohr-Coulomb failure criterion parameterized by a friction angle. Measured friction angles are generally large for single grains, smaller for large numbers of grains, and no theory exists for intermediate numbers of grains. We propose that a continuum of friction angles exists between single-grain and bulk friction angles due to grain-to-grain force chains. Physical experiments, probabilistic modeling, and discrete element modeling demonstrate that friction angles decrease by up to 15° as the number of potentially mobile grains increases from 1 to ~20. Decreased stability occurs as longer force chains more effectively dislodge downslope "keystone" grains, implying that bulk friction angles are set by the statistics of single-grain friction angles. Both angles are distinct from and generally larger than grain contact-point friction, with implications for a variety of sediment transport processes involving small clusters of grains. Key Points Documents a continuous transition between grain-pocket and bulk friction anglesImportant for patchy sediment in fluvial, aeolian, and gravitational transportBridges gap between macroscale constitutive laws and particle-based laws ©2014. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84921771462&doi=10.1002%2f2014GL061981&partnerID=40&md5=546da8e9037647ff5a09ee1e3ba9096e
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/6740
Appears in Collections: 气候减缓与适应
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作者单位: Department of Geology, Portland State University, Portland, OR, United States
Recommended Citation:
Booth A.M.,Hurley R.,Lamb M.P.,et al. Force chains as the link between particle and bulk friction angles in granular material[J]. Geophysical Research Letters,2014-01-01,41(24).