Microscale deformation behavior of sandstone mineral particles based on XCT scanning
(1. Power China Huadong Engineering Corporation Limited, Hangzhou 311122, China;
2. School of Resources and Safety Engineering, Central South University, Changsha 410083, China;
3. School of Resources Environment and Safety Engineering, University of South China, Hengyang 421000, China)
2. School of Resources and Safety Engineering, Central South University, Changsha 410083, China;
3. School of Resources Environment and Safety Engineering, University of South China, Hengyang 421000, China)
Abstract: This work aimed to quantify the physical and mechanical behavior of three-dimensional microstructures in rocks under uniaxial compression. A high-precision in situ XCT (X-ray transmission computed tomography) technology was applied to investigating the behavior of mineral grains in sandstone: the movement, the rotation deformation, and the principal strains between fault zone and non-fault zone. The results indicate that after unloading, the shear strain of mineral grains is periodic in the radial direction, the strain of mineral grains in the fracture zone is about 30 times of the macro strain of the specimen, which is about 5 times in the non-fracture zone, and the shear strain near the fault zone is larger than the compressive strain, and there is the shear stress concentration feature.
Key words: grain deformation; in situ XCT; failure behavior; Stokes rotation; material line