Performance of a novel bump control pillar extracting technique during room-and-pillar retreat coal mining
Book
·
OSTI ID:7271106
Retreat pillar mining concentrates stresses on workings directly outby 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 destressing techniques. Maximum strain energy storage in chain pillars appears to have occurred just prior to the first of four split cuts. At that point at 15-ft wide, highly fractured perimeter confined the core of the 55-by 70-ft pillars, permitting the pillar core to support tremendous pressures. Splitting the chain pillars into two 17.5-by 70-ft wings removed the confinement load, resulting in pillar yield. 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.
- OSTI ID:
- 7271106
- Country of Publication:
- United States
- Language:
- English
Similar Records
Performance of a novel bump-control pillar-extracting technique during room-and-pillar retreat coal mining. Report of Investigations/1989
Evaluating bump control techniques through convergence monitoring
Room-and-pillar mining in bump-prone conditions and thin pillar mining as a bump mitigation technique. Report of Investigations/1993
Technical Report
·
Sat Dec 31 23:00:00 EST 1988
·
OSTI ID:5539145
Evaluating bump control techniques through convergence monitoring
Journal Article
·
Wed Jul 01 00:00:00 EDT 1987
· Coal Min. Process.; (United States)
·
OSTI ID:6206905
Room-and-pillar mining in bump-prone conditions and thin pillar mining as a bump mitigation technique. Report of Investigations/1993
Technical Report
·
Thu Dec 31 23:00:00 EST 1992
·
OSTI ID:5388981