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Influence of Rock Discontinuities on Coal Mine Subsidence.

Authors
O'Connor-KM; O'Rourke-JE; Carr-JR
Source
NTIS: PB/84-166370 :129 pages
Link
NIOSHTIC No.
10003381
Abstract
This report documents the process of literature review, site selection, instrument installation, data acquisition, and preliminary data reduction performed to evaluate the influence of rock mass discontinuities on coal mine subsidence. A system of surface, subsurface, and mine level instrumentation ranged from 630 to 1,040 ft thick. Survey monuments, borehole pressure cells, full- profile borehole inclinometer-extensometers, mine level extensometers, stressmeters, and tap extensometer convergence stations were installed to monitor displacements and stress changes. Final design of the instrumentation system was based on (1) review of available information, (2) field mapping and analysis of areal photography, (3) drilling, and (4) borehole geophysics. The report contains the complete graphed data of stress and displacements accompanying the longwall mining of a 4,800-ft-long by 480-ft-wide coal panel.
Publication Date
19830101
Document Type
CP; Final Contract Report;
Fiscal Year
1983
NTIS Accession No.
PB84-166370
NTIS Price
A08
Identifying No.
OFR 30-84
NIOSH Division
TCRC;
Source Name
NTIS: PB/84-166370
Performing Organization
Woodward-clyde Consultants
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