Collapsing process of uniform granular slopes

Hsien Ter Chou, Ching Fang Lee

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

2 Scopus citations


The processes of rock avalanches and slope sliding are closely related to the granular physics. In this study, the relaxation process of dry granular slopes is experimentally examined in a transparent plexiglass chute with particle image analysis. Three types of uniform spherical beads were used at different bottom slopes and channel widths to explore these flow characteristics. The angles during the early slip phase are close to the failure angles associated with active earth pressure according to the Mohr-Coulomb friction law. For given sizes (d) and slopes (?), the flowing progress can be represented by a logarithm curve, being decreasing with the dimensionless time parameter t*. Velocity profiles measured at the side-wall depict a linear distribution on the top and an exponential tail near the static region at the bottom. According to the conservation of mass and momentum, the measured depth-averaged velocity and flowing thickness collapse well with an exponential laws.

Original languageEnglish
Title of host publicationPowders and Grains 2009 - Proceedings of the 6th International Conference on Micromechanics of Granular Media
Number of pages4
StatePublished - 2009
Event6th International Conference on Micromechanics of Granular Media, Powders and Grains 2009 - Golden, CO, United States
Duration: 13 Jul 200917 Jul 2009

Publication series

NameAIP Conference Proceedings
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616


Conference6th International Conference on Micromechanics of Granular Media, Powders and Grains 2009
Country/TerritoryUnited States
CityGolden, CO


  • Avalanches
  • Depth-average velocity
  • Granular flows
  • Slip phase


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