Title: Performance of a novel bump-control pillar-extracting technique during room-and-pillar retreat coal mining. Report of Investigations/1989
Abstract:Retreat pillar mining concentrates stresses on workings directly out by gob areas, which can result in coal mine bumps. The development of bump-control design criteria by the U.S. Bureau of Mines was ...Retreat pillar mining concentrates stresses on workings directly out by gob areas, which can result in coal mine bumps. The development of bump-control design criteria by the U.S. Bureau of Mines was furthered by data from a novel bump control mining method at the Olga Mine, McDowell County, WV. The pillar splitting, retreat mining system induced large pillar pressure increases and roof-to-floor convergence. Roof-to-floor convergence monitoring proved to be a valuable tool in evaluating the pillar splitting mining method and localized distressing techniques. Maximum-strain energy storage in chain pillars appears to have occurred just prior to the first of the split cuts. Thus, the pillar-splitting mining method successfully redistributed the weight of the roof away from the pillar line. Shot fire and auger-drilling destressing techniques augmented the pillar-splitting mining method by redistributing the weight of the roof.Read More
Publication Year: 1989
Publication Date: 1989-01-01
Language: en
Type: article
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Cited By Count: 1
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