Overview of USBM microseismic instrumentation and research for rock-burst mitigation at the Galena Mine, 1987-1993.
Proceedings: Mechanics and Mitigation of Violent Failure in Coal and Hard-Rock Mines. Washington, DC: U.S. Bureau of Mines, 1995 May; :283-302
Mining-related microseismic activity at the Galena Mine, Wallace, ID, was targeted by the U.S. Bureau of Mines for studies of possible indicators of imminent rock bursts. Two systems were developed and deployed for microseismicity studies: one involving routine monitoring of several rock-burst-prone stopes and the other using digitally recorded signals. Research included a complete analysis of microseismic location errors for both systems. P-wave polarity patterns and focal mechanisms were correlated with local geology and intrastope activity. Evidence for sympathetic interstope activity was found. In a tomographic study, the area of greatest velocity decrease in a pillar that had been acoustically scanned did not correlate with microseismicity. A correlation was found between seismicity and sudden offsets in stope closure gage and borehole pressure cell signals, though aseismic creep accounted for 20 to 70 pet of the closure signals. Clustering, fractality, and planarity analyses were done on the microseismic data. Research at the Galena Mine indicates there is not a reliable indicator of all rock bursts that can be identified at the present time. For rock-burst forecasting, it may be crucial to identify, characterize, and measure the mechanics of mine geologic structures in both seismic and aseismic areas of a mine.
Mining-industry; Rock-falls; Rock-bursts; Rock-mechanics; Underground-mining; Control-technology; Geology; Geophysics; Engineering-controls; Ground-control; Ground-stability; Computer-software; Statistical-analysis
Book or book chapter
Maleki-H; Wopat-PF; Repsher-RC; Tuchman-RJ
Proceedings: Mechanics and Mitigation of Violent Failure in Coal and Hard-Rock Mines