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• Inelastic deformation of rock under a hemispherical drill bit
• Drillability determination :a drillability index for percussion drills
• Development of a mechanical roof breaker for ground control in longwall operations under massive roof
• Assessment of subsidence data from the northern Appalachian basin for subsidence prediction
• Mechanical behavior of coal measure rocks :elastic-inelastic behavior
• Time-dependent behavior of coal measure rocks :adsorption rate and strength degradation
• Determining horizontal displacement and strains due to subsidence