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Geological factors in rock bursts in the Coer D-Alene Mining District: structure.
White-BG; Whyatt-JK; Scott-DF
Proceedings: Mechanics and Mitigation of Violent Failure in Coal and Hard-Rock Mines. Washington, DC: U.S. Bureau of Mines, 1995 May; :217-229
Research conducted by the U.S. Bureau of Mines indicates that both rock bursts and nonviolent wall rock deformation in the Coeur d' Alene Mining District are strongly controlled by preexisting structures. These structures include sheared, steeply dipping bedding; gouge-filled faults; and variably oriented joints. The locations and extent of burst damage are strongly influenced by the orientation of mine openings with respect to these structures. Burst damage related to preexisting structures results primarily from (1) buckling of narrow, tabular rock masses into mine openings and (2) fault-slip on bedding planes or preexisting faults. Buckling-type failures occur when development openings intersect bedding, faults, or joints at acute angles. Fault-slip failures most typically occur along bedding or fault planes that intersect veins near pillar-stope margins as wall rock moves into mine openings. Rock-burst damage and related ground support problems may be reduced by (1) planning development openings so they cut bedding, faults, and joints at angles greater than 50 degrees, (2) giving extra attention to ground support in situations where unfavorable geometries cannot be avoided, and (3) destressing or eliminating pillars.
Mining-industry; Rock-falls; Rock-bursts; Rock-mechanics; Underground-mining; Control-technology; Geology; Geophysics; Engineering-controls; Ground-control; Ground-stability; Metal-mining
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
Page last reviewed: September 2, 2020
Content source: National Institute for Occupational Safety and Health Education and Information Division