Title page for ETD etd-03042009-040821
|Type of Document
||Numerical analyses of the effectiveness of secondary tailgate support systems :a stability approach
||Master of Science
|Karmis, Michael E.
|Smith, Charles W.
|Date of Defense
A numerical model was developed to analyze the effectiveness of
active and passive secondary support systems on the stability of a retreating
longwall tailgate opening. The range of loading conditions that any tailgate can
be subjected to was identified to form the basis of numerical modeling. The
tailgate entry was considered as a part of roof-pillar-floor system, whose
behavior is controlled largely by the structural integrity of each member.
Numerical modeling was then conducted on tailgate openings to determine roof,
floor, and rib responses, including failure modes to a variety of loading
conditions for wood cribs and roof trusses employed as active and passive
means of secondary support. Trends were developed from numerical modeling
to determine optimum load capacity and paints of application for reducing the
potential for entry failure.
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