Zberovskyi V. Development of scientific and technical bases of hydroimpulsive influence on outburst coal layers

Key words: volatile coal seam, development working, cavitation generator, velocity and frequency of self-oscillations, hydropulse loosening. The object of researches is the processes of changing the state of the coal-gas system in an anthropogenic-corrupted carbonaceous massif, the redistribution of stresses and the cavitation flow of the liquid during its high-pressure injection into the coal bed. The aim of the work is to develop the scientific and technical bases of hydropulse action and to develop a method for hydropulse loosening of hazardous coal seams to increase the speed of excavations and create safe working conditions. Research methods. In the dissertation work the complex of scientific research methods was used, which included: the analysis of theoretical and experimental researches based on the hypotheses, theories and forms of finding the gas in the coal, the conditions and factors of the violation of the natural equilibrium of the coal-gas system, the boundary state of the boundary part of the ejection-dangerous coal seams and the rock displacement; the analysis of the advanced achievements of science and technology on researches of hydrodevelopment of coal seams - in the formulation of a scientific problem; experimental research of the phenomenon of periodically-breaking cavitation - in the simulation of the process of pulsed fluid injection; analytical and calculation methods - to improve the engineering method for calculating dynamic parameters and characteristics of self-oscillations of fluid pressure, which are created by a device of hydropulse action; statistical analysis with the use of modern electronic computers in processing the results of laboratory and mining-experimental studies based on the methods of continuous media mechanics, liquid and gas filtration, numerical simulation using the finite element method.