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Three-dimensional time-lapse velocity tomography of an underground longwall panel.

Authors
Luxbacher-K; Westman-E; Swanson-P; Karfakis-M
Source
Int J Rock Mech Min Sci 2008 Jun; 45(4):478-485
NIOSHTIC No.
20033836
Abstract
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.
Keywords
Longwall-mining; Coal-mining; Mining-industry; Rock-bursts; Underground-mining; Ground-control; Ground-stability; Structural-analysis
Contact
Kray Luxbacher, Department of Mining & Minerals Engineering, Virginia Tech., Blacksburg, VA 24061-0239, USA
Publication Date
20080601
Document Type
Journal Article
Email Address
kraylux@vt.edu
Fiscal Year
2008
NTIS Accession No.
NTIS Price
Issue of Publication
4
ISSN
1365-1609
NIOSH Division
SRL
Priority Area
Mining
Source Name
International Journal of Rock Mechanics and Mining Sciences
State
VA; WA
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