Abstract
To reveal the influence of different loading conditions on the damage evolution of jointed sandstone, the numerical model with realistic mesostructure was established using CT scans and RFPA3D. Moreover, uniaxial compression tests of similar simulated specimens were performed. Three-dimensional fractures were extracted and reconstructed. A digital image-based rock microscopic scale fractured box dimension algorithm was written in MATLAB to analyze the three-dimensional fractal features of the AE fields. Studies have revealed that plane-to-plane and point-to-plane loading are both the mixed failure of tension and compression. Whereas point-to-point loading is a compression failure, and multi-point loading is a tensile failure. There are significant variations in damage characteristics and evolution of multi-point loading; the specimen’s fractal dimension is 2.5622, which is the largest, and it has the most significant crack propagation, the most complicated rupture mode, and a relatively good damage effect. The fractal dimension determined by the AE field can quantitatively assess the mesoscale damage evolution. The research findings are significant in understanding the rules of jointed sandstone breakage and energy consumption, in addition to searching for an effective and energy-saving rock-breaking technology.
Article highlights
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The influence of different loading conditions on the damage and fracture evolution of jointed irregular sandstone is investigated in three dimensions.
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Using self-written programs, extract and reconstruct the fracture structure, quantify fractal characteristics of the whole fracture process.
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The impact of different loading conditions on the mining and crushing was revealed.
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Acknowledgements
The financial support provided by the National Natural Science Foundation of China (Nos. 51774101, 51964007), the Guizhou Mining Power Disaster Early Warning and Control Technology Innovation Team, China (No. 2019-5619), the Startup Project for High-level Talents Training Project in Guizhou Province, China (No. 2016-4011); and the Guizhou Science and Technology Department (Grant Number [2021] general 516).
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Hao, Z., Zuo, Y., Liu, H. et al. Mesoscopic damage evolution characteristics of jointed sandstone under different loading conditions. Geomech. Geophys. Geo-energ. Geo-resour. 8, 92 (2022). https://doi.org/10.1007/s40948-022-00390-6
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DOI: https://doi.org/10.1007/s40948-022-00390-6