Abstract
To research the influence of different confining pressures on the damage evolution of defective sandstone, the sandstone numerical model with real mesostructure is established by RFPA3D using CT scan, and then carried out a triaxial compression test. The two-dimensional and three-dimensional mesoscale fracture box dimension algorithm using the digital image is compiled by MATLAB to quantitatively analyze the fractal characteristics. According to the research, as confining pressure increases, the stress corresponding to each characteristic point increases noticeably, and the specimen follows the law of transition from brittle to plastic failure under high confining pressure. The 0 MPa specimen is a tensile failure, the 5 MPa specimen is a tensile-shear mixed failure, and the 10 MPa and 15 MPa specimens are shear failures. Two types of fractal dimensions assess sandstone damage based on fracture development and fragmentation. The greater the fractal dimension, the more complete the fracture mode, and the greater the damage degree. Compared with other specimens, the mechanical characteristics and damage evolution of 0 MPa specimens are greatly different, and the fractal dimension is the largest.
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Funding
Financial support provided by the National Natural Science Foundation of China (No. 51774101 and No. 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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Zuo, Y., Hao, Z., Liu, H. et al. Mesoscopic damage evolution characteristics of sandstone with original defects based on micro-ct image and fractal theory. Arab J Geosci 15, 1673 (2022). https://doi.org/10.1007/s12517-022-10896-8
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DOI: https://doi.org/10.1007/s12517-022-10896-8