Three-dimensional time-lapse velocity tomography of an underground longwall panel.
Luxbacher-K; Westman-E; Swanson-P; Karfakis-M
Int J Rock Mech Min Sci 2008 Jun; 45(4):478-485
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.
Longwall-mining; Coal-mining; Mining-industry; Rock-bursts; Underground-mining; Ground-control; Ground-stability; Structural-analysis
Kray Luxbacher, Department of Mining & Minerals Engineering, Virginia Tech., Blacksburg, VA 24061-0239, USA
International Journal of Rock Mechanics and Mining Sciences