Abstract
Underground mining of coal seams in the Upper Silesian Coal Basin is currently performed under difficult geological and mining conditions. The mining depth, dislocations (faults and folds) and mining remnants are responsible for rockburst hazard in the highest degree. This hazard can be minimized by using active rockburst prevention, where destress blastings play an important role. Destress blastings in coal seams aim to destress the local stress concentrations. These blastings are usually performed from the longwall face to decrease the stress level ahead of the longwall. An accurate estimation of active rockburst prevention effectiveness is important during mining under disadvantageous geological and mining conditions, which affect the risk of rockburst. Seismic source parameters characterize the focus of tremor, which may be useful in estimating the destress blasting effects. Investigated destress blastings were performed in coal seam no. 507 during its longwall mining in one of the coal mines in the Upper Silesian Coal Basin under difficult geological and mining conditions. The seismic source parameters of the provoked tremors were calculated. The presented preliminary investigations enable a rapid estimation of the destress blasting effectiveness using seismic source parameters, but further analysis in other geological and mining conditions with other blasting parameters is required.
Highlights
Rockburst is a dangerous dynamic catastrophic phenomenon that occurs during deep underground coal mining in the Upper Silesian Coal Basin (USCB)
Seismic source parameters characterize the focus of tremor, which may be useful in estimating the destress blasting effects
Investigated destress blastings were performed in coal seam no. 507 during its longwall mining in one of the coal mines in the Upper Silesian Coal Basin under difficult geological and mining conditions
Summary
Rockburst is a dangerous dynamic catastrophic phenomenon that occurs during deep underground coal mining in the Upper Silesian Coal Basin (USCB). In the active rockburst prevention, long-hole destress blasting (i.e. torpedo blasting) in the roof rocks plays an important role. The main purpose of these blastings is to reduce stress concentrations in the rock mass and fracture the thick layers of strong roof rocks to prevent or minimize the effect of high-energy tremors on the excavations or reduce the seismic hazard. The seismic energy of provoked tremor is the main parameter to estimate the destress blasting effectiveness in hard coal mines Seismic source parameters cannot be excluded as a useful tool for the estimation of the effectiveness and seismic energy of the long-hole destress blasting in the roof rocks. We attempt to determine the seismic source parameters of tremors provoked by the long-hole destress blasting stages in the roof rocks during the longwall mining of coal seam no.
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