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Effects of various longwall chain pillar configurations on gate road stability.

Authors
Listak-JM; Zelanko-JC; Barton-TM
Source
USBM :17 pages
Link
NIOSHTIC No.
10006179
Abstract
The Bureau of Mines conducted a field study to assess the performance of various chain pillar configurations in terms of gate road entry stability. Vibrating wire stressmeters (vws's) were installed in four consecutive gate road chain pillars. Field data collected during panel retreat were analyzed to gain a better understanding of the mechanics of vertical load redistribution in gate road chain pillars as it relates to ground control problems. Several different pillar configurations were investigated including abutment-yield and yield-abutment-yield designs. Vws data indicate that average pillar loads were lower and appeared to stabilize when an abutment-yield pillar arrangement was utilized. Data analyses also support the occurrence of severe roof and pillar deterioration that was visually observed in the tailgate entries during panel extraction.
Publication Date
19880101
Document Type
IH; Report of Investigations;
Fiscal Year
1988
NTIS Accession No.
NTIS Price
Identifying No.
RI-9184
NIOSH Division
PRC;
Source Name
U.S. Bureau of Mines
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