Title page for ETD etd-09182008-063231
|Type of Document
||Harwood, Cary P.
||Optimizing secondary tailgate support selection
||Master of Science
||Mining and Minerals Engineering
|Karmis, Michael E.
|Luttrell, Gerald H.
- coal mining
- secondary support
|Date of Defense
A model was developed to facilitate secondary tailgate support selection based on
analysis of a data base of over 100 case studies compiled from two different surveys of
operating longwall coal mines in the United States. The ALPS (Analysis of Long wall
Pillar Stability) program was used to determine adequacy of pillar design for the
successful longwall case histories. A relationship was developed between the secondary
support density necessary to maintain a stable tailgate entry during mining and the CMRR
(Coal Mine Roof Rating). This relationship defines the lower bound of secondary support
density currently used in longwall mines. The model used only successful tailgate case
history data with adequate ALPS SF according to the CMRR for each case. This model
facilitates mine design by predicting secondary support density required for a tailgate entry
depending on the ALPS SF and CMRR, which can result in significant economic benefits.
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