Analysis of retreat mining pillar stability
- Bureau of Mines, Pittsburgh, PA (United States). Pittsburgh Research Center
Preventing pillar line squeezes, massive pillar collapses, and coal pillar bumps is critical to the safe and efficient recovery of coal during retreat mining operations. To help prevent these problems, the US Bureau of mines has developed the Analysis of Retreat Mining Pillar Stability (ARMPS) computer program. ARMPS calculates stability factors (SF) based on estimates of the loads applied to, and the load-bearing capacities of, pillars during retreat mining operations. The program can accommodate various retreat mining scenarios including angled crosscuts, varied entry spacings, barrier pillars between the active section and old (side) gobs, and slab cuts in the barriers on retreat. It also features a pillar strength formula that considers the greater strength of rectangular pillars. The program may be used to evaluate bleeder energy designs as well as active workings. A data base of 130 pillar retreat case histories has been collected across the United States to verify the program. It was found that satisfactory conditions were very rare when the ARMPS SF was less than 0.75. Conversely, very few unsatisfactory designs were found where the ARMPS SF was greater than 1.5.
- OSTI ID:
- 124671
- Report Number(s):
- CONF-950811--; ISBN 0-930284-56-9
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
A CODES
COAL MINING
COMPUTERIZED SIMULATION
CONTINUOUS MINERS
DATA COMPILATION
EQUATIONS
INFORMATION SYSTEMS
MATERIALS RECOVERY
MITIGATION
PORTABLE EQUIPMENT
POWERED SUPPORTS
RECOMMENDATIONS
REMOTE CONTROL
RETREAT MINING
ROCK BURSTS
STRATA CONTROL
STRESS ANALYSIS
SUPPORT PILLARS
VALIDATION