Weak rock mass design for underground mining operations.
Pakalnis-R; Brady-TM; Hughes-P; Caceres-C; Ouchi-AM; MacLaughlin-MM
Proceedings of the International Workshop on Rock Mass Classification in Underground Mining. Mark C; Pakalnis R; Tuchman RJ, eds., Pittsburgh, PA: U.S. Department of Health and Human Services, Public Health Service, Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, 2007 May; :119-127
A major focus of ground control research presently being conducted by the Geomechanics Group at the University of British Columbia, Canada, in conjunction with the National Institute for Occupational Safety and Health's (NIOSH) Spokane Research Laboratory, is the development of design guidelines for underground mining within weak rock masses. The study expands upon the span design curve for man-entry operations and the stability graph for nonentry operations developed at UBC by extending the application to weak rock masses. The original database has been augmented by weak rock mass information from mines throughout the United States, Canada, Australia, Indonesia, and Europe. The common factor in all of these mines is the presence of a weak back and/or walls. This paper expands on the North American database and how the design curves have been employed at mining operations throughout the world. The definition of a weak rock mass for this study has been defined as having an RMR76 under 45% and/or a Q-value under 1.0.
Mining-industry; Underground-mining; Coal-mining; Hard-rock-mines; Geology; Geophysics; Rock-mechanics; Analytical-models; Mathematical-models; Engineering; Information-processing; Information-retrieval-systems
National Institute for Occupational Safety and Health, Pittsburgh Research Laboratory, 626 Cochrans Mill Road, Pittsburgh, PA 15236
Marc-C; Pakalnis-R; Tuchman-RJ
Proceedings of the International Workshop on Rock Mass Classification in Underground Mining