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A correlation between seismic tomography, seismic events and support pressure.

Authors
Westman-EC; Heasley-KA; Swanson-PL; Peterson-S
Source
Rock Mechanics in the National Interest. Vol. I, Lisse, Netherlands: A. A. Balkema, 2001 Jul; 1:319-326
Link
NIOSHTIC No.
20021482
Abstract
Coal bumps are brittle, violent failures associated with high stresses and competent host strata. To study bump mechanisms, conditions in the vicinity of a deep longwall mining face in bump-prone strata were monitored using three discrete systems. First, a microseismic monintoring network recorded mining-induced seismic events throughout the mine and surrouning strata. Second, pressure variations and distributions on the longwall shield legs across the face were recorded. Last, tomography surveys imaged seismic transmission properties ahead of the face. Results from the three systems were correlated in an effort to increase understanding of mining-induced stress redistribution and bump potential. An initial, one-week study showed that the correlation between averaged tomogram values and seismically active areas had a coefficient of correlation (R) of 0.89. Further results of these studies demonstrate that the tomography system is capable of imaging heavy shield-leg loading and bump-prone conditions prior to them disrupting the face operations.
Keywords
Coal-mining; Coal-miners; Monitoring-systems; Mining-industry; Mining-equipment; Underground-mining; Underground-miners; Ground-stability; Ground-control
Publication Date
20010101
Document Type
Book or book chapter; Conference/Symposia Proceedings
Editors
Elsworth-D; Tinucci-JP; Heasley-KA
Fiscal Year
2001
NTIS Accession No.
NTIS Price
ISBN No.
9026518277
NIOSH Division
PRL
Source Name
Rock Mechanics in the National Interest: Proceedings of the 38th U.S. Rock Mechanics Symposium, DC Rocks 2001, Washington, D. C., 7-10 July, 2001
State
PA; VA; WA
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