ABSTRACT:

The specimens under the conditions of uniaxial compression, different gas-pressure conditions (0.0, 0.5, 1.0, and 1.5 MPa), sample strengths, deformation, energy, count of acoustic-emission signals, and laws influenced by gas pressure were investigated by self-developed equipment for coal containing gas. The results show that with the increase of gas pressure, the elastic strain energy stored and dissipated energy decrease, no evident influence on the evaluation of rockburst tendency by elastic strain energy indices, but dissipated energy for unit volume strain decreases rapidly before the destruction of the specimen. However, AE signal of high ring count value occurs at a higher percentage of peak strength for samples in atmospheric condition when compared to gas-containing coal samples. Therefore, gas should be considered when the evaluation of rockburst tendency in high gassy coal mines.

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