Monitoring, assessment and mitigation of rock burst and gas outburst induced seismicity in longwall top coal caving mining

摘要

Underground coal extractions lead to continuous stress and pressure redistribution around mine openings which, in some cases, may lead to coal and gas outburst and rock bursts. This paper presents seismic monitoring research, which aimed at characterising the dynamic behaviour of the coal seam in response to gateroad development and longwall top coal caving mining at Coal Mine Velenje. The early campaigns involved time-lapse active seismic tomography and microseismic monitoring at the two selected longwall panels. Based on the findings of this early work, a more comprehensive microseismic monitoring programme was set up. Seismic monitoring data were processed and used for model development and rock burst/gas outburst risk assessment purposes, which also led to the development of measures to mitigate against seismic hazards.