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Rock Mechanics Research Decreases Longwall Bump Potential.

Authors
Barton-TM; Campoli-AA; Gauna-M
Source
SME Preprint 91-79 :6 pages
Link
NIOSHTIC No.
10011465
Abstract
Coal mine bumps, the violent failures of overstressed coal, present a safety hazard to miners when mining is conducted in deep, bump- prone coal mines. Two different longwall gate entry systems were evaluated in a southern Appalachian coal mine located in the Pocahontas No. 3 Coalbed under approximately 610 m of overburden which included a massive sandstone member. Both gate entry systems employed a center abutment pillar flanked by yield pillars. The original design employed a 24.2-M-square abutment pillar, while the new design employed a 36.6- By 54.9-M abutment pillar. Rock mechanics instrumentation data analysis and in-mine observations indicated that this increase in abutment pillar size significantly decreased bump potential. The new design in worse case conditions increased effective bearing area 62 pct with only a 9-pct increase in gate entry system width and eliminated face bumps that were experienced with the original gate entry design.
Publication Date
19910101
Document Type
OP;
Fiscal Year
1991
NTIS Accession No.
NTIS Price
Identifying No.
OP 209-92
NIOSH Division
PRC;
Source Name
SME Preprint 91-79
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