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Timing and duration of subsidence due to longwall mining.

Authors
Jeran-PW; Trevits-MA
Source
Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, RI 9552, 1995 Jan; :1-17
NIOSHTIC No.
20030773
Abstract
Subsidence data gathered by the U.S. Bureau of Mines over a series of longwall panels in the Pittsburgh Coalbed were studied to obtain insight as to the role of time in the subsidence process. It was found that subsidence began essentially with undermining and was completed within 1 year. The progress of the subsidence was dependent upon location above the panel. Subsidence in the central area of the subsidence trough, where subsidence is the greatest, was about 90 pct complete by the time the face had progressed a distance equal to one overburden thickness beyond a particular surface point. For a point over the rib of the longwall panel, the subsidence was only about 60 pct complete at this time. Data from three other sites in the northern Appalachian Coal Basin were analyzed to determine if an anomaly or the true characteristics of the subsidence process had been observed. All sites behaved similarly in the central portion of the subsidence trough. However, the subsidence of points over and adjacent tothe ribs of the longwall panels was site specific. The fact that movement across the width of the panel was not uniform should be taken into account in assessing damages or the potential for damages resulting from mining-induced subsidence.
Keywords
Mining; Mineral-industries; Mining-industry; Underground-mining; Coal-mining; Control-technology; Engineering-controls; Structural-analysis
Publication Date
19950101
Document Type
Report of Investigations
Fiscal Year
1995
NTIS Accession No.
PB95-221602
NTIS Price
A02
Identifying No.
RI-9552
NIOSH Division
PRC
Source Name
Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, RI 9552
State
PA
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