Abstract
The irregular shape of the sample can significantly affect the compression process. Establishing a numerical model of specimens based on real meso-structure is challenging because of the irregularity and the heterogeneity. This paper aimed to establish the three-dimensional numerical model based on real meso-structure using Rock Failure Process Analysis. We simulated the mechanical properties and deformation failure law of sandstone particles with different shapes under uniaxial compression. The effects of different shapes and heterogeneity on the mechanical behavior and fracture process of sandstone were studied. Furthermore, we discussed strength characteristics and failure modes of different particle shapes. Our results show that the stress–strain curve of the specimens has brittleness-ductility under uniaxial compression. Meanwhile, as stress increases, tensile failure accumulates in rocks, resulting in the macroscopic shear crack zone. The peak strength of sandstone specimens with different shapes decreases by increasing the k value. Moreover, the specimen fracture showed an obvious shape effect, and the heterogeneity in the breaking process determines the crack propagation path. The current findings may play an important role in the crushing method and energy-saving of rock mining.
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Funding
This study was supported by : (a) the National Natural Science Foundation of China (Project Nos. 51774101 and 51574093), (b) the Scientific and Technological Innovation Talents Team in Guizhou Province (Project No. [2019]5619), (c) Research and Demonstration of dynamic Disaster warning and control technology for deep mining of fine disseminated gold mine in Southwest Guizhou province, Guizhou Science and Technology Support Program (Guizhou Science and Technology Support [2021] General 516); (d) the Guizhou Province High-level Innovative Talents Training Project (Grant no. JZ2016-4011), Guizhou University Talent Introduction Foundation (Project No. 2017-63), the Cultivation Project of Guizhou University (Project No. [2017]5788-49), (e) the first-class subject construction project of civil engineering in Guizhou Province (Project No. QYNYL[2017]0013), and the Basic research project of Guizhou Province(No.20191116).
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Shi, Kw., Zuo, Yj., Sun, Wjb. et al. Fracture Mechanical Properties of Three—Dimensional Irregular Sandstone Particles Based on Digital-Image. Geotech Geol Eng 40, 4991–5005 (2022). https://doi.org/10.1007/s10706-022-02195-6
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DOI: https://doi.org/10.1007/s10706-022-02195-6