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Microseismic monitoring of a longwall coal mine. Volume III. Field study of mine subsidence.

Authors
Hardy-HR Jr.; Anani-BA; Khair-AW
Source
NTIS: PB/80-163413 :1-140
Link
NIOSHTIC No.
10001989
Abstract
Volume III presents the observed microseismic activity with surface subsidence. Field measurements of subsidence carried out at the Greenwich Colleries, Barnesboro, Pennsylvania, mine site are described. Comparison of field results with published National Coal Board data revealed marked differences. The influence of stronger rock beds overlying the coal seam in the current study was assumed to be the main cause. Use of the Gaussian profile resulted in a satisfactory fit to the field data, provided the value of the maximum field subsidence was used in the analysis. In general, when low tensile strengths were assumed for the associated rocks, finite element techniques gave results that compared well with the field data. The study also indicated that at shallow depths there is a marked difference in subsidence over dip and rise sides of the coal face, maximum subsidence is shifted more towards the dip side.
Publication Date
19770101
Document Type
CP; Final Contract Report
Fiscal Year
1977
NTIS Accession No.
PB80-163413
NTIS Price
A08
Identifying No.
OFR 30(3)-80
NIOSH Division
DRC
Source Name
NTIS: PB/80-163413
State
CO; PA
Performing Organization
Pennsylvania State University
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