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Instrumentation and Modeling of the North 140 Section of Magmont Mine, Bixby, Mo.

Authors
Tesarik-DR; McKibbin-RW
Source
MISSING :30 pages
Link
NIOSHTIC No.
10006544
Abstract
An instrumentation and numeric modeling study was conducted by the Bureau of Mines at the Magmont Mine in Bixby, Missouri. An isolated section of this room-and-pillar mine was monitored with borehole and closure extensometers during a pillar recovery program to determine stress redistribution. In situ stress measurements were taken in the rib before pillar extraction began. Sample cores from the boreholes were taken for analysis of the properties of the host rock in the laboratory. The extensometers recorded no measurable displacements during most of the operation. Two-dimensional, finite- element; three-dimensional, finite-element; and three-dimensional displacement discontinuity codes were used to model the area of study. The finite-element models were run with two initial stress conditions, i.e., stress due to gravity only and stress obtained by in situ measurements. Horizontal stresses in the models reduced the calculated factor-of-safety in the mine back by up to a factor of 10, but did not have a significant effect on calculated pillar stability.
Publication Date
19890101
Document Type
IH; Report of Investigations;
Fiscal Year
1989
NTIS Accession No.
NTIS Price
Identifying No.
RI 9215
NIOSH Division
SRC;
Source Name
MISSING
State
MO;
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