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Dense Granular Flows: Structure and Microscopic Origins of Internal Friction

Azéma, E. / Radjai, F.

By means of three-dimensional Contact Dynamics simulations, we investigate the microstructural properties of sheared granular packings by varying systematically the inertial number I from the quasi-static to the collisional regime. A detailed analysis of the connectivity of the particles reveals that the transition between the regimes is correlated to profound changes of the nature of the contact network. In particular, we show that the increase of internal friction angle with inertial number is mainly a consequence of contact anisotropy. As the inertial number increases, the role of force chains decreases and that of friction mobilization increases as long as percolating force chains are present in the system. A detailed analysis of the spatial correlations of floating particles, i.e., particles without bearing contacts, reveals the occurrence of “fluidized” volumes in the dense flow regime, which increase in size and coalesce at the approach of the collisional regime.

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Dense Granular Flows: Structure and Microscopic Origins of Internal Friction

Azéma, E. / Radjai, F.

By means of three-dimensional Contact Dynamics simulations, we investigate the microstructural properties of sheared granular packings by varying systematically the inertial number I from the quasi-static to the collisional regime. A detailed analysis of the connectivity of the particles reveals that the transition between the regimes is correlated to profound changes of the nature of the contact network. In particular, we show that the increase of internal friction angle with inertial number is mainly a consequence of contact anisotropy. As the inertial number increases, the role of force chains decreases and that of friction mobilization increases as long as percolating force chains are present in the system. A detailed analysis of the spatial correlations of floating particles, i.e., particles without bearing contacts, reveals the occurrence of “fluidized” volumes in the dense flow regime, which increase in size and coalesce at the approach of the collisional regime.

Dense Granular Flows: Structure and Microscopic Origins of Internal Friction

Azéma, E. / Radjai, F.

By means of three-dimensional Contact Dynamics simulations, we investigate the microstructural properties of sheared granular packings by varying systematically the inertial number I from the quasi-static to the collisional regime. A detailed analysis of the connectivity of the particles reveals that the transition between the regimes is correlated to profound changes of the nature of the contact network. In particular, we show that the increase of internal friction angle with inertial number is mainly a consequence of contact anisotropy. As the inertial number increases, the role of force chains decreases and that of friction mobilization increases as long as percolating force chains are present in the system. A detailed analysis of the spatial correlations of floating particles, i.e., particles without bearing contacts, reveals the occurrence of “fluidized” volumes in the dense flow regime, which increase in size and coalesce at the approach of the collisional regime.

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Title:

Dense Granular Flows: Structure and Microscopic Origins of Internal Friction

Additional title:

Springer Ser.Geomech.,Geoengineer.

Contributors:

Chau, Kam-Tim (editor) / Zhao, Jidong (editor) / Azéma, E. (author) / Radjai, F. (author)

Conference:

International Workshop on Bifurcation and Degradation in Geomaterials ; 2014 ; Hong Kong, Hong Kong

Published in:

Bifurcation and Degradation of Geomaterials in the New Millennium ; Chapter: 50 ; 347-353

Springer Series in Geomechanics and Geoengineering

Publication date:

2014-12-30

Size:

7 pages

ISBN:

978-3-319-13506-9 , 978-3-319-13505-2

ISSN:

1866-8763 , 1866-8755

DOI:

https://doi.org/10.1007/978-3-319-13506-9_50

Type of media:

Article/Chapter (Book)

Type of material:

Electronic Resource

Language:

English

Keywords:

Granular Flow , Force Chain , Force Network , Floating Particle , Force Anisotropy Engineering , Offshore Engineering , Geotechnical Engineering & Applied Earth Sciences

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