Study on gas pressure affected to bump potential of coal sample

In order to study an occurrence mechanism of the complex dynamic disaster from the gas content seam of the deep mine, an analysis was conducted from the view of the coal-rock mechanics property, acoustic emission features and energy dissipation. The uniaxial compression test system of the gas content coal compositation with the RMT-150C mode rock mechanics test machine and in combination with the DS5 mode full information acoustic emission signal analyzer were applied to study the evolution laws of the coal sample mechanics index and acoustic emission index under different gas pressure. The study results showed that the gas pressure was increased from 0 MPa to 2 MPa, the compressive strength of the coal sample was decreased by 31%, the elastic modulus were decreased with 32.1% and the Poisson’s ratio was increased by 46.9%. The dynamic failure time, elastic energy index and bump energy index of the coal sample would be decreased with the gas pressure increased. The bump potential of the coal sample would be changed from the strong bump potential to the weak bump potential. The accumulated numbers and accumulated energy of the coal acoustic emission signals were individually reduced by 55.1% and 58.3%. From the analysis on the energy consumption, with the gas pressure increased, the elastic energy and the consumption energy of the coal sample would be decreased and thus could show that the gas pressure increased could decline the bump tendency of the coal sample.