Journal
POWDER TECHNOLOGY
Volume 360, Issue -, Pages 1305-1320Publisher
ELSEVIER
DOI: 10.1016/j.powtec.2019.07.014
Keywords
Grain-scale Digital Rock; SEM; DEM; Digital Rock Failure simulation
Categories
Funding
- National Key Research and Development Program of China [2017YFC0805201]
- National Natural Science Foundation of China [51674158, 51574158, 51474106]
- Major Program of Shandong Province Natural Science Foundation [ZR2018ZA0602]
- Taishan Scholar Talent Team Support Plan for Advantaged & Unique Discipline Areas
Ask authors/readers for more resources
The microstructure of coal determines its mechanical behaviors under various loading conditions. In this study, DEM models were proposed based on the grain-scale reconstructed coal structure. The obtained SEM images were digitalized and converted to the binary digital images, and then introduced to build DEM numerical models reflecting the different microstructure characteristics of the coal. Finally, numerical simulation of biaxial compression were performed on each coal sample model. The results showed that different coal samples have different damage patterns under biaxial compression depending on their unique microstructural features. The initiation and propagation of tensile cracks are the main factors for the deformation and failure of coal samples. Near the peak strength of the axial stress, the average contact force between particles is the largest and the crack propagation speed is the fastest. In addition, high confining pressure and loading rate will promote the deformation and failure of coal samples. (C) 2019 Elsevier B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available