Mitigating destructive longwall bumps through conventional gate entry design. Report of Investigations/1990
The U.S. Bureau of Mines evaluated two different conventional longwall gate entry systems in the Southern Appalachian Basin, where mining and geologic conditions are conducive for coal pillar bumps. These gate entry systems were in a coal mine located in the Pocahontas No. 3 Coalbed under approximately 2,000 ft of overburden and a massive quartzite sandstone member, and both employed a center abutment pillar flanked by yield pillars. The 80-ft-square tailgate abutment pillars within the first study area began bumping 500 ft in advance of mining. This was accompanied by face bumps on the tailgate corner of the longwall face. The 120- by 180-ft tailgate abutment pillars within the second study area did not begin to bump until mining was approximately 100 ft past. Coalbed stress change and abutment pillar dilation data demonstrated that a 15-ft-wide perimeter of yielded coal surrounded a highly stressed core in both sizes of abutment pillars.
- Research Organization:
- Bureau of Mines, Pittsburgh, PA (USA). Pittsburgh Research Center
- OSTI ID:
- 6424915
- Report Number(s):
- PB-91-110700/XAB; BUMINES-RI--9325
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
012031* -- Coal
Lignite
& Peat-- Underground Mining-- Strata Mechanics & Control-- (1987-)
APPALACHIAN BASIN
BITUMINOUS COAL
BLACK COAL
CARBONACEOUS MATERIALS
COAL
COAL DEPOSITS
COAL MINING
COAL SEAMS
CONTROL
DESIGN
ENERGY SOURCES
FOSSIL FUELS
FUELS
GEOLOGIC DEPOSITS
GEOLOGIC STRUCTURES
LONGWALL MINING
MATERIALS
MINE ROADWAYS
MINERAL RESOURCES
MINING
NATIONAL ORGANIZATIONS
OVERBURDEN
RELAXATION
RESOURCES
ROCK BURSTS
ROCKS
SANDSTONES
SEDIMENTARY BASINS
SEDIMENTARY ROCKS
STRATA CONTROL
STRESS ANALYSIS
STRESS RELAXATION
STRESSES
SUPPORT PILLARS
TUNNELS
UNDERGROUND FACILITIES
UNDERGROUND MINING
US BUREAU OF MINES
US DOI
US ORGANIZATIONS
WORKING FACES