Title page for ETD etd-03242009-040935
|Type of Document
||Stress transfer between multi-seam longwall mines
||Master of Science
||Mining and Minerals Engineering
|Karmis, Michael E.
|Date of Defense
The future of most underground coal mining in the USA will entail the
extraction of coal under multi-seam mining conditions. Mine design in such an
environment will require the accurate prediction of stress transfer between
adjacent seams. The available knowledge on criteria controlling stress transfer
has been exhaustively reviewed and critical factors affecting multi-seam mining
investigated. Young's Moduli of rock layers, thickness of rock layers, number of
these layers and the coefficient of friction between these layers were identified
as important parameters which affect stress transfer from mining of one seam to
another. These parameters were studied using photoelastic methods and
results analyzed both qualitatively and quantitatively. Finite element studies
were also performed using UTAH2PC. Data obtained from field studies was
used to correlate laboratory findings with prototype observations. Excellent
correlation was obtained between laboratory and field data. Validity of the
research is demonstrated using case studies.
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