Pillar load transfer associated with multiple-seam mining. Report of Investigations/1987
Technical Report
·
OSTI ID:6314054
As part of a program to improve mine planning and development, the Bureau of Mines is investigating the effects of pillar load transfer which impacts on mining operations within a multiple-seam configuration. At two mine sites, the Bureau performed a complete geological analysis and installed and monitored instrumentation to gather pertinent data on rock mechanics. Overburden depth varied dramatically in the vicinity of the study area and reached a maximum at the study site; innerburden thickness was less than a pillar width (40 to 45 ft); heaving was experienced in both mines where sandstone and/or shale floor units were observed; overlays of the mine layouts show pillars were not totally superpositioned; a maximum of 5 in of roof to floor convergence was measured; and pressure readings indicated pillar core loading only and increased to a maximum of 7,000 psig over instrument setting pressure.
- Research Organization:
- Bureau of Mines, Pittsburgh, PA (USA). Pittsburgh Research Center
- OSTI ID:
- 6314054
- Report Number(s):
- PB-87-194338/XAB; BM-RI-9066
- Country of Publication:
- United States
- Language:
- English
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