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Microscopic origin of shape-dependent shear strength of granular materials: a granular dynamics perspective

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Abstract

The shear strength of granular materials has been found to increase nonlinearly with particle asphericity before reaching a steady value independent of particle asphericity. Although the origin of shear strength has been extensively studied, the underlying mechanism of its nonlinear dependency on particle shape remains unclear. In this study, we present a microscopic investigation of shape-dependent shear strength from the perspective of particle dynamics. A series of numerical simple shear tests on assemblies of ellipsoids with different aspect ratios are performed using the discrete element method. It is confirmed that the power-law scaling in nonlocal granular rheology is still valid for granular materials composed of non-spherical particles, such that the macroscopic shear strength and microscopic dynamics can be bridged using granular temperature. Analogous to other amorphous solids, granular materials with higher granular temperature are much softer and exhibiting less resistance to shear. The statistics of the clusters of the particles with higher granular temperature indicate that granular systems with different particle shapes showing different collective motion patterns. We further explore the coupling between rotational and translational particle dynamics and their long-range correlations. The macroscopic shear strength shows a clear monotonic relation with the intrinsic length scale reflecting long-range dynamic correlations. Finally, we propose a picture illustrating the negative feedback mechanism between particle rolling and sliding, which leads to the nonlinear increase and steady value of shear strength with particle asphericity. Our finding may shed light not only on the particle shape effects, but also on the fundamental understanding of the microscopic origin of shear strength of granular materials.

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Acknowledgements

We acknowledge the financial support from the National Natural Science Foundation of China (Grant Nos. 51825905 and U1865204) and Science project of China Huaneng Group Co. Ltd (HNKJ18-H26). JZ acknowledges the support of MOE Chang Jiang Scholars Scheme. The numerical calculations in this work have been done on the supercomputing system in the Supercomputing Center of Wuhan University.

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  1. State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan, 430072, China

    Yuxiong Zou, Gang Ma, Jiangzhou Mei & Wei Zhou

  2. Key Laboratory of Rock Mechanics in Hydraulic Structural Engineering of Ministry of Education, Wuhan University, Wuhan, 430072, China

    Yuxiong Zou, Gang Ma, Jiangzhou Mei & Wei Zhou

  3. Department of Civil and Environmental Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China

    Jidong Zhao

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Zou, Y., Ma, G., Mei, J. et al. Microscopic origin of shape-dependent shear strength of granular materials: a granular dynamics perspective. Acta Geotech. 17, 2697–2710 (2022). https://doi.org/10.1007/s11440-021-01403-6

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