Interactions between multiple-seam longwall and room-and-pillar operations. A case study in Boone County, WV. Report of Investigations/1990 (Final)
In order to reduce waste and improve resource conservation, mine planniNg, and development, the U.S. Bureau of Mines is investigating the effects of multiple seam interactions associated with longwall coal mining. Field investigations were conducted at a mine located in Boone County, WV, where a longwall panel was operating subjacent to room-and-pillar workings in an overlying seam. To assess the effects of overlying workings on longwall headgate stability, the Bureau gathered various geotechnical information at this minesite. Headgate pillars and entries were instrumented and monitored to study their behavior during side-abutment loading as the longwall panel approached and passed beneath the overlying room-and-pillar develpments. The two operations are separated by 800 ft of interburden, and although interactions between operations separated by this distance are uncommon, geomechanical measurements indicate the occurrence of an interaction. These measurements show that convergence on the headgate entries was most adverse subjacent to barrier pillars in the overlying mine. Pillar measurements indicate that side-abutment pressure increases were slightly greater than predicted values. Several factors related to both geology and mine design, believed responsible for this large interactive distance, are discussed.
- Research Organization:
- Bureau of Mines, Pittsburgh, PA (USA). Pittsburgh Research Center
- OSTI ID:
- 6424898
- Report Number(s):
- PB-91-110155/XAB; BUMINES-RI--9299
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
012031* -- Coal
Lignite
& Peat-- Underground Mining-- Strata Mechanics & Control-- (1987-)
COAL DEPOSITS
COAL MINES
COAL MINING
COAL SEAMS
DESIGN
DIMENSIONS
DOCUMENT TYPES
FEDERAL REGION III
FIELD TESTS
GEOLOGIC DEPOSITS
GEOLOGIC STRATA
GEOLOGIC STRUCTURES
GEOLOGY
LONGWALL MINING
MECHANICS
MINE ROADWAYS
MINERAL RESOURCES
MINES
MINING
MONITORING
NATIONAL ORGANIZATIONS
NORTH AMERICA
ORIENTATION
PROGRESS REPORT
RESERVOIR PRESSURE
RESOURCE CONSERVATION
RESOURCES
ROCK MECHANICS
ROOM AND PILLAR MINING
STABILITY
STRATA CONTROL
STRATA MOVEMENT
STRESS ANALYSIS
SUPPORT PILLARS
TESTING
THICKNESS
TUNNELS
UNDERGROUND FACILITIES
UNDERGROUND MINING
US BUREAU OF MINES
US DOI
US ORGANIZATIONS
USA
WEST VIRGINIA
WORKING FACES