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Humidity: A Cyclic Effect in Coal Mine Roof Stability.

Authors
Stateham-RM; Radcliffe-DE
Source
NTIS: PB 283 741 :19 pages
Link
NIOSHTIC No.
10007842
Abstract
Climatic conditions were compared with roof fall occurrence from April 1, 1972, to December 31, 1975, by the Bureau of Mines. These comparisons indicated that humidity has a strong influence on roof fall occurrence rates. Cubic regression techniques were used to develop best fit curves. Statistical analysis of these curves indicated that both were sinusoidal and exhibited positive correlation with each other. The sine waves have a period of 1 year with maximum and minimum inflection points in August and February.
Publication Date
19780101
Document Type
IH; Report of Investigation;
Fiscal Year
1978
NTIS Accession No.
PB-283741
NTIS Price
A03
Identifying No.
RI 8291
NIOSH Division
DRC;
Source Name
NTIS: PB 283 741
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