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A Case Study of Ground Control Problems Related to Multiple Seam Mining in the Pittsburgh and Sewickley Coalbeds.

Authors
Chekan-GJ; Matetic-RJ; Galek-JA
Source
Soc Min Eng AIME Preprint 85-325 1985 :10 pages
Link
NIOSHTIC No.
10004906
Abstract
The Bureau of Mines is currently investigating strata interactions associated with the mining of multiple coalbeds. Strata interactions due to subsidence are a result of undermining. This study involves underground investigations at a mine where room and pillar panels are actively being developed through an area of the Sewickley coalbed that was subsided by undermining of the Pittsburgh coalbed. Research to date indicates that undermining had little effect on upper mine pillar stability but had a more severe effect on the development and maintenance of entries. Roof-to-floor measurements recorded over four times more convergence in entries developed over gob as compared with entries developed over support pillars in the lower mine. Consequently, this has led to major roof falls in the active panels, resulting in considerable production delays and supplemental roof support costs.
Publication Date
19850101
Document Type
OP;
Fiscal Year
1985
NTIS Accession No.
NTIS Price
Identifying No.
OP 5-86
NIOSH Division
PRC;
Source Name
Soc. Min. Eng. AIME Preprint 85-325, 1985, 10 Pp
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