New Criteria to Assess Seismic and Rock Burst Hazard in Coal Mines

摘要

The paper presents new criteria of seismic and rock burst hazard assessment in Polish hard coal?mines where longwall mining system is common practice. The presented criteria are based on the results?of continuous recording of seismic events and analysis of selected seismological parameters: spatial?location of seismic event in relation to mining workings, seismic energy, seismic energy release per unit?coal face advance, b-value of Gutenberg-Richter law, seismic energy index EI, seismic moment M0,?weighted value of peak particle velocity PPVW. These parameters are determined in a moving daily time?windows or time windows with fixed number of seismic tremors. Time changes of these parameters are?then compared with mean value estimated in the analyzed area. This is the basis to indicate the zones of?high seismic and rock burst hazard in specific moment in time during mining process. Additionally, the?zones of high seismic and rock burst hazard are determined by utilization of passive seismic tomography?method. All the calculated seismic parameters in moving time windows are used to quantify seismic and?rock burst hazard by four level scales. In practice, assessment of seismic and rock burst hazard is used?to make daily decision about using rock burst prevention activities and correction of further exploitation?of monitored coal panel.