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Large-scale strata response to longwall mining: a case study.

Authors
Kneisley-RO; Haramy-KY
Source
Denver, CO: U.S. Department of the Interior, Bureau of Mines, RI 9427, 1992 Jan; :1-25
NIOSHTIC No.
10011456
Abstract
This U.S. Bureau of Mines report summarizes a study of large-scale strata response to longwall mining at a western U.S. coal mine. This study utilized surface and subsurface measurements, geologic mapping, in situ stress measurements, and pressure cell readings to characterize strata behavior. Preliminary analysis of surface subsidence and time-domain reflectometry (TDR) was used to determine a suggested main roof caving sequence. Coal ejected from the face apparently resulted from brittle failures that occurred because of lack of significant yield zone development. The combination of a strong coal with pronounced directional behavior, low overburden pressures, a good caving roof, and a high-production environment that minimized time-dependent loading apparently reduced yielding of the longwall face. The panel 1 headgate-entry design appears adequate; however, the abutment pillar and adjacent panel tailgate rib are highly stressed and may contribute to problems during second panel mining. The small chain pillar yielded after passage of the face, but the pillar width may be near maximum since evidence of a stressed core exists.
Keywords
Mining-industry; Underground-mining; Rock-mechanics; Rock-falls; Rock-bursts; Longwall-mining; Ground-control; Ground-stability
Publication Date
19920101
Document Type
IH; Report of Investigations
Fiscal Year
1992
NTIS Accession No.
NTIS Price
Identifying No.
RI-9427
NIOSH Division
DRC
Source Name
Denver, CO: U.S. Department of the Interior, Bureau of Mines, RI 9427
State
PA; CO
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