Numerical simulation study on particle breakage behavior of granular materials in confined compression tests--颗粒学报PARTICUOLOGY

Yu, Y., Zhao, G., & Ren, M. (2023). Numerical simulation study on particle breakage behavior of granular materials in confined compression tests. Particuology, 74, 18-34. https://doi.org/10.1016/j.partic.2022.04.004

Numerical simulation study on particle breakage behavior of granular materials in confined compression tests

Yang Yu, Guangsi Zhao ^*, Minghui Ren

State Key Laboratory for Geomechanics and Deep Underground Engineering, School of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou, 221116, China

10.1016/j.partic.2022.04.004

Volume 74, March 2023, Pages 18-34

Received 3 January 2022, Revised 22 March 2022, Accepted 5 April 2022, Available online 4 May 2022, Version of Record 31 May 2022.

E-mail: zhaoguangsi@cumt.edu.cn

Highlights

• Evolution law of contact and contact force during the loading process is revealed.

• Two particle failure modes caused by different contact force states are presented.

• Stress based on maximum contact force and major principal stress can better reflect distribution of cracks.

• Relationship between size effect of particle breakage and lateral pressure coefficient is demonstrated.

Abstract

In order to study the fragmentation law, the confined compression experiment of granular assemblies has been conducted to explore the particle breakage characteristic by DEM approach in this work. It is shown that contact and contact force during the loading process gradually transform from anisotropy to isotropy. Meanwhile, two particle failure modes caused by different contact force states are analyzed, which are single-through-crack failure and multi-short-crack failure. Considering the vertical distribution of the number of cracks and the four characteristic stress distributions (the stress related to the maximum contact force, the major principal stress, the deviatoric stress and the mean stress), it is pointed out that the stress based on the maximum contact force and the major principal stress can reflect the distribution of cracks accurately. In addition, the size effect of particle crushing indicates that small size particles are prone to break. The lateral pressure coefficient of four size particles during the loading process is analyzed to explain the reason for the size effect of particle breakage.

Graphical abstract

Keywords

Granular materials; Confined compression; Particle breakage; Meso-mechanics; Discrete element method

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