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Analytical Modeling of Coal Mine Roof Behavior.

Authors
Langland-RT
Source
NTIS: Ucrl/52586 :99 pages
Link
NIOSHTIC No.
10002031
Abstract
Using a finite element computer code developed for the Bureau of Mines to calculate roof sag, convergence, roof bolt load change, and standard engineering property information, a comprehensive series of three-dimensional calculations at three different sites in a room- and-pillar coal mine were performed. The calculated results were then compared with experimental results obtained from an extensive in-site field measurement program. General agreement was obtained between the analytical and field results showing that three- dimensional, finite element modeling of mining can be an extremely useful tool for understanding mine behavior. A series of parametric studies were also performed that examined the effects of changing the viscoelastic time parameters, varying the preload on the bolts, and changing the effective stiffness of the bolts.
Publication Date
19780101
Document Type
CP; Final Contract Report;
Fiscal Year
1978
NTIS Accession No.
UCRL/52586
NTIS Price
A06
Identifying No.
OFR 41-81
NIOSH Division
SRC;
Source Name
NTIS: Ucrl/52586
Performing Organization
Lawrence Livermore Lab.
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