EPJ Web Conf.
Volume 249, 2021Powders & Grains 2021 – 9th International Conference on Micromechanics on Granular Media
|Number of page(s)||4|
|Section||Particle Shape Effects|
|Published online||07 June 2021|
Impact of sample scaling on shear strength: coupled effects of grains size and shape
SRK Consulting Australasia, Sydney, Australia
2 LMGC, Université de Montpellier, CNRS, Montpellier, France
3 Institut Universitaire de France (IUF), Paris, France
4 Universidad de los Andes, Bogotá, Colombia
5 University of Newcastle, Newcastle, Australia.
6 Sherwood Geotechnical and Research Services, Peregian Beach, Australia.
7 SRK Consulting, Vancouver, Canada
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**** e-mail: Stephen.Fityus@newcastle.edu.au
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Published online: 7 June 2021
Size limitations of geotechnical testing equipment often require that samples of coarse granular materials have to be scaled in order to be tested in the laboratory. Scaling implies a convenient modification of the particle size distribution (PSD) to reduce particle sizes. However, it is well known that particle size and shape may be correlated in nature, due to geological factors (as an example). By means of two-dimensional contact dynamics simulations, we analyzed the effect of altering the size span on the shear strength of granular materials when particle size and shape are correlated. Two different systems were considered: one made of only circular particles, and the second made of size-shape correlated particles. By varying systematically the size span we observed that the resulting alteration of material strength is not due to the change in particle sizes. It results instead from the variation of the particle shapes induced by the modification of the PSD, when particle size and particle shape are correlated. This finding suggests that particle shape distribution is a higher order factor than PSD for the shear strength of granular materials. It also highlights the importance of particle shape quantification in soil classification and the case for its consideration in activities such as sampling, subsampling, and scaling of coarse materials for geotechnical testing
A video is available at https://doi.org/10.48448/xe39-qg57
© The Authors, published by EDP Sciences, 2021
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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