Details:

Personal Author:
Tesarik, D. R. (Douglas R.) ; McKibbin, R. W. (Robert W.)
Tesarik, D. R. (Douglas R.) ; McKibbin, R. W. (Robert W.) Less -
Corporate Authors:
United States. Bureau of Mines.
Description:
"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." - NIOSHTIC-2

NIOSHTIC no. 10006544


Subjects:
[+]
Pillaring (Mining) -- Mathematical Models. Pillaring (Mining) -- Testing.
Series:
Report of investigations (United States. Bureau of Mines) ; 9215
Document Type:
Report
Place as Subject:
Montana ; Magmont Mine (Mo.)
Montana ; Magmont Mine (Mo.) Less -
Collection(s):
Stephen B. Thacker CDC Library collection
Main Document Checksum:
[+]
urn:sha256:9c7b39ebb0a9b7c4e20ae82e3f1e0012a5c6b203d016d579e1eaa5c1c0f9fb44
Download URL:
https://stacks.cdc.gov/view/cdc/10549/cdc_10549_DS1.pdf
File Type:

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