Mining Publication: Three-Dimensional Time-Lapse Velocity Tomography of an Underground Longwall Panel
Three-dimensional velocity tomograms were generated to image the stress redistribution around an underground coal longwall panel to produce a better understanding of the mechanisms that lead to ground failure, especially rockbursts. Mining-induced microseismic events provided passive sources for the three-dimensional velocity tomography. Surface-mounted geophones monitored microseismic activity for 18 days. Eighteen tomograms were generated and high-velocity regions correlated with high abutment stresses predicted by numerical modeling. Additionally, the high-velocity regions were observed to redistribute as the longwall face retreated, indicating that velocity tomography may be an appropriate technology for monitoring stress redistribution in underground mines.
Peer Reviewed Journal ArticleJune - 2008
NIOSHTIC2 Number: 20033836
Int J Rock Mech Min Sci 2008 Jun; 45(4):478-485