THE ASSESSMENT OF THE GEODYNAMIC STATE OF ROCK MASSIFS IN DEEP MINES OF THE NORILSK-TALNAKH POLYMETALLIC DEPOSIT
The extensive seismological data bank for one of the deep mines of the Norilsk-Talnakh polymetallic deposit is analyzed in order to assess the rock-burst hazard of rock massifs. The criterion proposed for this assessment is based on the relation of kinematic characteristics of seismic processes used as migration velocity of reduced center of seismic energy release and apparent rate of aftershocks related to the time of their occurrence for selected major seismic events within the controlled zones of mine field stresses concentration. The minimum value of this parameter characterizes the state of controlled area of the rock mass as rock-burst hazardous. The most significant energy-related seismic events occurring in such time periods result in the rock massif “discharging” the accumulated energy. Then the value of the rock-burst hazard parameter increases, and the controlled area passes into non-hazardous state. Verification of the proposed parameter for assessing the rock-burst hazard, performed for the “Skalisty” mine of the Norilsk polymetallic deposit for the period 2015 - 2017, has demonstrated that the ratio of the kinematic characteristics of seismic processes can serve with a high degree of reliability as a criterion for rock-burst hazard of controlled areas of rock massifs.