1. Interfacial contact characteristics and energy evolution of gas-bearing coal seams at different shear rates.
- Author
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Hu, Jiaying, Guo, Yangyang, Chen, Xuexi, Chen, Xingyu, and Yang, Tao
- Subjects
- *
SHEAR (Mechanics) , *COAL mining , *STABILITY (Mechanics) , *COAL gas , *SHEAR strength - Abstract
Coal mine geological tectonic belts have a high incidence of coal mine gas disasters. The deformation and displacement of tectonic belts under geological action are the typical characteristics of a "tectonic interface." It is of great significance to study the shear mechanics and stability of the tectonic interface of gas-bearing coal seams to clarify the mechanisms of geologic structure control outburst. In this paper, the interfacial shear seepage coupling tests of coal seams under different shear rates are carried out, and the displacement and mechanical properties of interfacial contact points under different shear rates are studied on a mesoscale basis. The main conclusions are as follows: with the increase in shear rate, the interfacial shear strength and stick-slip stress decrease, but the number of stick-slip events increases correspondingly. The interfacial friction coefficient is negatively correlated with the shear rate, and the sensitivity of the interfacial friction coefficient decreases with the increase in the shear rate. With the increase in shear rate, the meshing degree of shear convex decreases and the meso-contact stress decreases. As the shear rate increases, less energy is released and fewer cracks are generated by dissipated energy. Finally, the evolution law of macroscopic mechanics-meso-contact-energy transformation of the interface during shearing is expounded. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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