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- Title
Mesoscopic damage evolution characteristics of sandstone with original defects based on micro-ct image and fractal theory.
- Authors
Zuo, Yujun; Hao, Zhibin; Liu, Hao; Pan, Chao; Lin, Jianyun; Zhu, Zehua; Sun, Wenjibin; Liu, Ziqi
- 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.
- Subjects
SANDSTONE; FRACTURE mechanics; FRACTAL dimensions; NONCRYSTALLINE defects; DIGITAL images
- Publication
Arabian Journal of Geosciences, 2022, Vol 15, Issue 22, p1
- ISSN
1866-7511
- Publication type
Article
- DOI
10.1007/s12517-022-10896-8