METHOD AND SYSTEM FOR ANALYSIS OF GEOLOGICAL STRUCTURE AND RELATIVE CHANGES IN STRESS IN THE LAYERS LOCATED ABOVE THE WORKINGS OF AN UNDERGROUND MINE

A method of analysis of a geological structure and relative changes in stress in the layers located above the mining workings of an underground mine. Data from a mobile measurement data recorder (3) and from a central station of a mine seismic system (10) obtained as a result of closely correlated in time recording of low-frequency seismic noise (Dn.cz.) from the surface system and of seismic bursts generated by mining (Dwcz) are transmitted to a stationary processing center (1). Recorded measurement data in time windows of preferably 30-seconds, in the form of the 3-axis recordings of low-frequency seismic noise (Dn.cz.) and seismic bursts generated by mining (Dw.cz.), are processed using a method of seismic interferometry for the noise recordings, and passive velocity/attenuation tomography for the recordings of the mine bursts. On this basis, isolines of the transverse wave velocity of the longitudinal wave velocity/attenuation in the method of passive velocity/attenuation tomography are determined for the studied area (7). These isolines represent the average state of relative changes in stress (∆NP) in the layers above the mining workings (B). For a mining burst (W), the location coordinates (X, Y, and Z) and the calculated time (To) of its occurrence are correlated with the times (Tp) of the first arrivals of the longitudinal wave generated by this rock burst in the recordings of the 3-axis low-frequency measuring stations (5) of the wave recorded on the mine surface, and the corresponding rise times of the signal from the first input of the longitudinal wave until the recorded signal of the rock burst (W) reaches the first maximum in each measurement station (5). A corresponding system is described. L'invention concerne un procédé d'analyse d'une structure géologique et de variations relatives de contrainte dans les couches situées au-dessus des travaux d'exploitation d'une mine souterraine, selon lequel des données sont transmises à un centre de traitement stationnaire (1) à partir d'un dispositif mobile d'enregistrement de données de mesure (3) et d'une station centrale de système sismique de mine (10), ces données étant le résultat d'un enregistrement étroitement corrélé dans le temps du bruit sismique basse fréquence (Dn.cz.) depuis le système en surface et d'explosions sismiques provoquées par l'exploitation minière (Dw.cz.). Ensuite les données de mesure enregistrées, dans des laps de temps de 30 secondes de préférence, sous forme d'enregistre