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Influence of grain size and basic element size on rock mechanical characteristics: insights from grain-based numerical analysis

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Abstract

The mechanical properties of rock materials are closely related to their heterogeneous internal structure. It is necessary to reproduce the internal structure of rock materials in more realistic models to learn more about their mechanical properties. In this paper, using the three-dimensional particle flow code (PFC) developed by Itasca, a novel grain-based model (GBM) is proposed to group and fill mineral grains. Then, the GBM is used in numerical simulations of uniaxial compression tests to investigate the influence of grain size and basic element size on the distributions of contacts and microcracks and the mechanical behaviour of numerical samples. The numerical results show that based on the proposed GBM, the heterogeneous structure of granite can be reproduced in a more realistic way by the multilevel division of contacts and microscale cracks. The stress–strain curves of the numerical samples with different grain sizes and basic element sizes can be divided into three stages during loading, including the elastic deformation, nonlinear deformation and post-peak softening stages. As the grain size increases, the number of basic elements contained within a single mineral grain increases. As a result, the number of intragranular contacts increases with increasing bond micro-strength. The external load required to cause macroscopic failure of a sample increases as the number of intragranular cracks increases. As the basic element size increases, the number of basic elements contained within a single mineral grain decreases, and the contact distribution density is significantly smaller. The number of contacts to be fractured decreases when macroscale fracturing of a sample occurs, which leads to a decrease in the value of the external load.

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Funding

The research presented in this paper was carried out under the financial support of the National Natural Science Foundation of China (Grant Nos. 52179118, 52104101, 52174092), funded by the Graduate Innovation Program of China University of Mining and Technology (2022WLKXJ032) and the Postgraduate Research & Practice Innovation Program of Jiangsu Province (KYCX22_2581).

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Correspondence to Liyuan Yu.

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Zhang, T., Yu, L., Peng, Y. et al. Influence of grain size and basic element size on rock mechanical characteristics: insights from grain-based numerical analysis. Bull Eng Geol Environ 81, 347 (2022). https://doi.org/10.1007/s10064-022-02856-z

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