Abstract
The meso morphologies of the fracture surface of cracked rock mass indirectly reflects its internal damage evolution process. In this paper, the SEM scanning images of the specimens with different pre-existing cracks under uniaxial compression are post processed by MATLAB and IPP. Moreover, the damage evolution of meso structure in the failure process of the specimen is quantitatively studied, which establishes the relationship between macroscopic failure and meso mechanism. It is found that when the crack initiates, the damage degree of meso structure in the crack tips decreases with the increase of the inclination angle of pre-existing crack, and the weakening effect of tensile cracks on the strength of specimen is greater than that of shear cracks. Subsequently, when the crack propagates, the inclination angle of pre-existing crack has little influence on the damage rate of the meso structure.
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Acknowledgements
The authors would like to acknowledge the financial support of the National Natural Science Foundation of China (No. 41202193 and No. 41572262), Innovation Program of Shanghai Municipal Education Commission (No. 15ZZ016), and Shanghai Rising-Star Program (No. 17QC1400600).
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Zhou, Y., Zhao, C., Zhao, C., Xie, J. (2018). Study on the Rock Damage Characteristics Based on SEM Test. In: Zhang, L., Goncalves da Silva, B., Zhao, C. (eds) Proceedings of GeoShanghai 2018 International Conference: Rock Mechanics and Rock Engineering. GSIC 2018. Springer, Singapore. https://doi.org/10.1007/978-981-13-0113-1_32
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DOI: https://doi.org/10.1007/978-981-13-0113-1_32
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