Dubyts'ka M. Improving the method of disjunctive faults forecast by acoustic geolocation when mining gently sloping coal layers

In the thesis, the actual scientific and technical problem of raising efficiency of low-amplitude geological disturbances forecast in coal layers by the method of non-destructive testing up to 95 % is solved. The comprehensive mine, laboratory and analytical research concerning propagation of acoustic oscillations in the complex structured rock massif with geological faults by using different methods of probing acoustic signal generation are organized and conducted. The mathematical model of spreading acoustic wave packet in the dispersion medium based on the information and amplitude-phase modulation of carrying frequencies of the probing signal is proposed and justified. An effective method of the forecasting hidden disjunctives in coal layers by the method of non-destructive testing is developed. The method is based on the analysis of characteristic emergencies of geological faults in the functions of a signal modulation parameters obtained by acoustic probing of coal-rock massif. The regularities obtained from the research results are used to develop recommendations regarding the tectonic structure of coal layers for mines "Dniprovska", "Krasnolymanska" and "Stepova".