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Long-term Response of a Coal Mine Roof to Time Lapse Between Exposure and Support.

Authors
Radcliffe-DE; Stateham-RM
Source
MISSING :12 pages
Link
NIOSHTIC No.
10000907
Abstract
The Bureau of Mines, as part of an agreement with the Bear Coal Company, Somerset, Colorado, Evaluated the response of a coal mine roof to time lapse. Time lapse, the interval between exposure and support of the roof, was studied using both imstrumentation and statistics. Instrumentation studies were designed to equate displacement and rates of displacement with areas of roof left unsupported from 15 minutes to more than 4 days. A statistical study was completed to compare roof fall occurrence with time lapse intervals encountered during normal room-and-pillar mining. Results from this investigation show time lapse, in the Bear Mine, to be insignificant with respect to roof stability after installation of permanent support.
Publication Date
19800101
Document Type
IH;
Fiscal Year
1980
NTIS Accession No.
NTIS Price
Identifying No.
TPR 110
NIOSH Division
DRC;
Source Name
MISSING
State
CO;
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