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Field Evaluation of Yield Pillar Systems At a Kentucky Longwall Headgate.

Authors
Mark-C; Barton-TM
Source
Proc 7th Int'l Conf on Ground Control in Mining 1988 :1-9
Link
NIOSHTIC No.
10006157
Abstract
This paper describes research conducted by the Bureau of Mines to assess the effectiveness of different chain pillar designs in maintaining gate entry stability. The study described in this paper was performed in a 1,200-ft-long, experimental headgate section which contained three pillar designs: a three-entry, yield-abutment pillar system, a four-entry, yield-yield-abutment pillar system, and a five-entry, all-yield pillar system. As the longwall mined by the experimental section, Bureau engineers monitored entry convergence, roof sag, and changes in roof quality. The results of the study indicate that the all-yield system performed at least as well as, and probably better than, the two abutment pillar systems.
Publication Date
19880101
Document Type
OP;
Fiscal Year
1988
NTIS Accession No.
NTIS Price
Identifying No.
OP 104-88
NIOSH Division
PRC;
Source Name
Proc. 7th Int'l Conf. on Ground Control in Mining, 1988, PP. 1-9
State
KY;
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