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Gate design key to bump control.

Authors
Campoli-A; Barton-T; Van Dyke-F; Gauna-M; DeMarco-M
Source
Coal 1990 Sep; 95(9):54-58
Link
NIOSHTIC No.
10008417
Abstract
Two different gate road designs, located within the Pocahontas No. 3 Seam on Island Creek Coal property, were evaluated by the U.S. Bureau of Mines using two detailed instrument arrays and in-mine observations. The state-of-the-art instrumentation arrays consisted of stainless steel, borehole-platened flatjacks used to indicate changes in pillar stress, coal extensometers for measuring pillar dilation, convergence stations for measuring roof-to-floor closure, a differential roof-sag indicator, and a differential floor-heave indicator. A permissible data acquisition system was employed to continuously monitor coalbed stress and roof-to-floor convergence in hazardous areas. The resulting improved gate road design will permit high-extraction, retreat longwall mining through bump-prone conditions, with the minimal risk of destructive face bumps. Insight into what determines the ultimate strength of coal pillars and the effects of yield zone confinement at pillar failure have further advanced the current knowledge of bump prevention based on longwall gate road design.
Keywords
Mining-industry; Underground-mining; Coal-mining; Injury-prevention; Geology; Longwall-mining; Room-and-pillar-mining; Retreat-mining; Engineering-controls; Control-technology
CODEN
COALEN
Publication Date
19900901
Document Type
OP; Journal Article
Fiscal Year
1990
NTIS Accession No.
NTIS Price
Identifying No.
OP 267-90
Issue of Publication
9
ISSN
1040-7820
NIOSH Division
PRC
Source Name
Coal
State
PA
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