Granular particle shape and its influence on Triaxial Test results

M.M. Mollanouri Shamsi, A.A. Mirghasemi, K. Mosavat

In the proceedings of: GeoManitoba 2012: 65th Canadian Geotechnical Conference

Session: M1A - Soil Mechanics I

ABSTRACT: This paper at first models Triaxial Test numerically with a program based on Discrete Element Method. Evaluating the effect of grain shape on triaxial test results, different groups of grain with different angularities were modeled. To discriminate different shapes of particles two shape description factors, Sphericity and Angularity Index (A.I) were defined. Several triaxial compression tests with different confining pressure and friction coefficients were carried out. Then the results were compared with experimental ones. The results demonstrated the significant influence of angularity of granular particles on the triaxial test results, for instance, by increasing angularity in a specified confining pressure, mobilized friction angle and dilation increase significantly, and values of mobilized friction angle and dilation were increased significantly in lower confining pressure.

RÉSUMÉ: grains avec anguleux différents ont été modélisés. Afin de discriminer différentes formes de particules, deux facteurs de description de la forme, l'indice de sphéricité et angularité (AI) ont été définis. Plusieurs essais de compression triaxiale avec une pression de confinement et de coefficients de frottement différents ont été effectués. Ensuite, les résultats ont été comparés avec ceux obtenus expérimentalement. Les résultats ont démontré l'influence significative de l'angularité des particules granulaires sur les résultats des essais triaxiaux, par exemple, en augmentant angularité dans une pression déterminée de confinement, de l'angle de frottement mobilisé et de dilatation augmentent considérablement, et les valeurs de l'angle de frottement mobilisé et la dilatation ont été augmentés de manière significative de la pression de confinement inférieure.

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Cite this article:
M.M. Mollanouri Shamsi; A.A. Mirghasemi; K. Mosavat (2012) Granular particle shape and its influence on Triaxial Test results in GEO2012. Ottawa, Ontario: Canadian Geotechnical Society.

@article{Paper227,author = M.M. Mollanouri Shamsi; A.A. Mirghasemi; K. Mosavat,title = Granular particle shape and its influence on Triaxial Test results,year = 2012}