Microseismic monitoring of a longwall coal mine. Volume III. Field study of mine subsidence.
Hardy-HR Jr.; Anani-BA; Khair-AW
NTIS: PB/80-163413 :1-140
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.
CP; Final Contract Report
NTIS Accession No.
Pennsylvania State University