Rockburst Hazard and Energy Release in Coal in Case of Thermal-Mechanical Coupling
Dewei Fan1,2, Aiwen Wang1,2,3, Yishan Pan1,2,3, Linghai Kong4, Shankun Zhao4, Kun Lv4
1Institute of Disaster Rock Mechanics, Liaoning University; Shenyang, China
2Environmental Engineering College, Liaoning University, Shenyang, China
3School of Mechanics and Engineering, Liaoning Technical University, Fuxin, China
4Coal Science and Technology Research Institute Co., Ltd, Beijing, China
Keywords: Coal samples, thermal-mechanical coupled loading, bursting proneness and energy release, fracture mode, coal mass
Abstract
The spontaneous high-temperature conditions in deep mining cause significant changes in one of the factors that determine the risk of rock burst in coal mine roadways. Therefore, based on the test method of the bursting proneness of coal, uniaxial loading tests were conducted on coal specimens under different thermal loads to explore the variations in the bursting proneness and energy release of heated coal, analyze the variations and mechanism controlling the coal skeleton, physicochemical properties, quality, fracture mode evolution, and macrocrack quantity with different loading rates, and calculate and discuss the changes in the critical conditions of a coal-rock system during heating. In summаry, the study of the change in bursting energy release caused by the heating of coal can lay the foundation for the engineering-based prevention and control of composite dynamic disasters in deep coal mines.
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