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Master of Science in Mining Engineering (MSMIE)
Dr. Zach Agioutantis
For stiff beams that can form over the gob of longwall panels, the potential seismic magnitude of the energy released upon strata caving is estimated. Analytical calculations are used to verify two-dimensional models of longwall roof beams to determine the strain energy and gravitational energy developed, that will then be released to surrounding mine workings. Models are developed using RS2 to model the stress, strain, and deflection along the bottom of the longwall roof beam to calculate gravitational and strain energies.
The total energy is then converted to seismic magnitude. Strain energy was consistently less than gravitational energy, except for beams with heights below 15 m in height. Gravitational energy is shown to be the main driving factor in energy release, except for the beams with low heights. Analyses allow the determination of beam characteristics based on seismic data.
The analysis is then refined using swelling factor to compare various beam drop heights. The models show an increase in seismic magnitude for higher drop heights. However, the actual data provided by Buchanan mine displays a decrease in seismic magnitude with increasing drop height, indicating that energy is dissipated into the broken gob material as drop height increases.
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This thesis was supported by the Central Appalachian Regional Education and Research Center (CARERC) through Grant 6T42OH010278 in 2022.
Gerwig, Caroline, "Strain Energy Analysis Related To Strata Failure During Caving Operations" (2022). Theses and Dissertations--Mining Engineering. 72.