Korol V. Improving of the acoustic method of prediction of gas-dynamic phenomena in coal mines

The dissertation is devoted to solving the actual problem of prediction of gas-dynamic phenomena in coal mines. As a result of processing of large statistical data about gas-dynamic phenomena over the last 25 years it was found that with increasing depth and intensity of processing of coal seams the number of sudden coal and rock bursts, and gas release in coal mines increases with the linear dependence that allows, on this basis to forecast anticipated danger. Formulated and solved the problem of acoustic wave propagation in structurally inhomogeneous coal seam, which is considered as a waveguide, and its interaction with a Griffith crack. In this case, it was assumed that the power of the acoustic wave generated by Griffith crack is equal to the absorbed part of the artificial acoustic oscillations. It is proved, that the frequency response of acoustic signal functionally related to the level of fracture stresses in the coal seam. On the basis of probabilistic solutions of the problem it is proved the effectiveness of the parallel analysis of the structure, the acoustic signal on the three independent parameters which were selected and shown to be weak functional dependence among them. On this basis, developed a method of forecasting the gas-dynamic phenomena and made appropriate changes to the algorithm of the main signal. The probability of correct prediction increased to 0.875. Full-scale studies were conducted in the mines, are being hazardous on gas-dynamic phenomena. As objects of study it was chosen mine Krasnolimanskaya, kochinskogo mine, "Krasnoarmiyska-Zahidna № 1". Then apparatus AK-1M was not used as a standard means of prediction. The tests proved the high sensitivity and reliability of the equipment, which allowed not only do predict gas-dynamic phenomena, but the presence of faults in coal and rock array.