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Time variations in coal mine roof fall rates.

Authors
Stateham-RM; Radcliffe-DE
Source
Cycles 1979 Jan; 23(9):197-205
Link
NIOSHTIC No.
10001081
Abstract
Roof fall occurrence rates are examined for repetitive variations that indicate cyclic influences on coal mine roof stability. Two cyclic influences are identified, humidity and earth tides. The humidity effect on coal mine roof fall occurrence follows the annual cycle of the seasons (1 year). The tidal effect follows the synodic lunar cycle (29.53 Days).
Keywords
Mining-industry; Underground-mining; Ground-control; Engineering-controls; Control-technology
Publication Date
19790101
Document Type
OP; Journal Article
Fiscal Year
1979
NTIS Accession No.
NTIS Price
Identifying No.
OP 13-79
Issue of Publication
9
ISSN
0011-4294
NIOSH Division
DRC
Source Name
Cycles
State
CO
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