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Roof Rock Structures and Related Roof Support Problems in the Pittsburgh Coalbed of Southwestern Pennsylvania.

Authors
Moebs-NN
Source
NTIS#: PB 267 922 :30 pages
Link
NIOSHTIC No.
10000820
Abstract
The Bureau of Mines investigated severe coal mine roof support problems along a section of main entries in the Pittsburgh coalbed in southwestern Pennsylvania to identify the causative factors. The mine roof was examined in detail, and various sedimentary structures are described that contributed directly to irregular and unstable roof. Small-scale paleochannels, scours, and related slickensides were identified as the leading cause of bad roof, and isopach maps were prepared to illustrate a method whereby the presence of these structures could be inferred in advance of mining. Probably second in importance was the occurrence of relatively incompetent flaggy, poorly cemented sandstone, weakened by coal and micaceous laminea. No effect of in situ stresses on roof stability was detected.
Publication Date
19770101
Document Type
IH; Report of Investigations
Fiscal Year
1977
NTIS Accession No.
PB-267922
NTIS Price
A03
Identifying No.
RI 8230
NIOSH Division
PRC;
Source Name
NTIS#: PB 267 922
State
PA;
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