Structural stress and concentration of mining-induced seismicity.
Whyatt-JK; White-BG; Blake-W
Proceedings: Mechanics and Mitigation of Violent Failure in Coal and Hard-Rock Mines. Washington, DC: U.S. Bureau of Mines, 1995 May; :243-264
In situ stress on the scale of a tunnel or mine may be distorted by geologic structures. The resulting variations of in situ stress have a direct bearing on the potential for mining-induced seismicity. New evidence from the Lucky Friday Mine collected by U.S. Bureau of Mines researchers, as well as a review of case studies, demonstrates that in situ stress variations affect the spatial distribution of mining-induced seismicity. Although over core stress measurements have been useful in these studies, they are too expensive and, depending on conditions, may be too difficult' to use routinely in mapping stress variations. However, information from borehole and raisebore breakouts; deformation of mine openings; and patterns of seismicity, ground-control problems, and rock-burst damage can be used to build a stress database. This database can then be used in conjunction with maps of mine structure and geology and models of rock mass behavior to build a map of in situ stress variations. Such a map provides a means to anticipate patterns of mining-induced seismicity that are likely to be encountered and, hence, provide a means for planning appropriate measures to ameliorate rock-burst hazards.
Mining-industry; Rock-falls; Rock-bursts; Rock-mechanics; Underground-mining; Control-technology; Geology; Geophysics; Engineering-controls; Ground-control; Ground-stability
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