Roof and rib hazard assessment for underground stone mines.
Society for Mining, Metallurgy, and Exploration, Inc., Preprint No. 97-113, For Presentation at the SME Annual Meeting, Denver, Colorado - February 24-27, 1997 1997 Feb; :1-5
The results of a hazard assessment of roof and rib conditions in underground stone mines were presented. Hazards presented by roof and rib conditions were assessed in 33 mines in seven different states, 32 of which used the room and pillar mining method. Techniques to minimize roof and rib hazards were described. These included selecting stable roof beams and roof lines, and taking into account specific local stresses and geological and mining conditions when designing the mine layout. A smooth competent roof and ribs free of loose rocks were recommended, as was the use of observation holes to determine stable beam characteristics as a mine develops away from the highwall or outcrop. Other factors discussed included the effects of weather, humidity, temperature, and ground water on the strength of roof and rib rocks, techniques for the determination of stable roof lines, and the use of vertical and horizontal stress measurements and data on geologic discontinuities in the development of safe mine layouts.
Underground-mining; Mine-shafts; Safety-engineering; Worker-health; Mining-industry; Industrial-engineering; Industrial-hazards; Occupational-hazards;
Society for Mining, Metallurgy, and Exploration, Inc., Preprint No. 97-113, For Presentation at the SME Annual Meeting, Denver, Colorado - February 24-27, 1997, 5 pages, 5 references