Investigation of micro-scale shear response of sand–rubber granule mixture in terms of particle shape and grain scale deformability effects--颗粒学报PARTICUOLOGY

Ari, A., & Akbulut, S. (2024). Investigation of micro-scale shear response of sand–rubber granule mixture in terms of particle shape and grain scale deformability effects. Particuology, 90, 452-469. https://doi.org/10.1016/j.partic.2024.01.013

Investigation of micro-scale shear response of sand–rubber granule mixture in terms of particle shape and grain scale deformability effects

Abdulmuttalip Ari^*, Suat Akbulut

Department of Civil Engineering, Yildiz Technical University, Istanbul, 34220, Turkey

10.1016/j.partic.2024.01.013

Volume 90, July 2024, Pages 452-469

Received 12 September 2023, Revised 19 January 2024, Accepted 24 January 2024, Available online 3 February 2024, Version of Record 21 February 2024.

E-mail: talipari@yildiz.edu.tr

Highlights

• Particle shape is reflected in DEM analyses using image processing techniques.

• Grain-scale deformability is simulated using linear-parallel bond contact model.

• Rubber deformability is calibrated using a uniaxial compression test conducted.

• Two-dimensional direct shear tests are performed with DEM.

• Micro scale parameters are associated with macro scale shear response.

Abstract

In this study, the effects of particle shape of rigid sand and soft rubber materials on macro-scale shear response were reasoned based on micro-scale parameters. For this purpose, first, the shape properties of three different sand and two different rubber samples were quantified using image processing techniques, and the contact model parameters were calibrated through physical experiments. The direct shear test was simulated in a two-dimensional discrete element software with realistic particle forms. The soft nature of rubber particles was reflected using body-centered cubic packing with a linear-parallel bond contact model. As a result, coordination number, distribution of contact forces (i.e., strong contact, and fabric anisotropy), and contact sliding were derived by the numerical analyses. It has been observed that the particle shape leads to distinctive micro-scale responses due to the variations in the stiffness of the contacts.

Graphical abstract

Keywords

Particle shape; Sand; Rubber; Shear response; Micro-scale response; Discrete element method

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