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Practical boundary-element modeling for mine planning.

Heasley-KA; Chekan-GJ
Proceedings of the Second International Workshop on Coal Pillar Mechanics and Design, Pittsburgh, PA: National Institute for Occupational Safety and Health, (NIOSH) 99-114, IC-9448, 1999 Jun; :73-87
As part of the initial investigation and validation of a new boundary-element formulation for stress modeling in coal mines, the underground stresses and displacements at two multiple-seam coal mines with unique stress problems were modeled and predicted. The new program, LAMODEL, calculates stresses and displacements at the seam level and at requested locations in the overburden or at the surface. Both linear elastic and nonlinear seam materials can be used, and surface effects, multiple seams, and multiple mining steps can be simulated. In order to most efficiently use LAMODEL for accurate stress prediction, the program is first calibrated to the site-specific geomechanics based on previously observed stress conditions at the mine. For this calibration process, a previously mined area is "stress mapped" by quantifying the observed pillar and strata behavior using a numerical rating system. Then, the site-specific mechanical properties in the model are adjusted to provide the best correlation between the predicted stresses and the observed underground stress rating. Once calibrated, the model is then used to predict future stress problems ahead of mining. At the two case study mines, the calibrated models showed good correlation with the observed stresses and also accurately predicted upcoming high stress areas for preventive action by the mines.
Mining-industry; Underground-mining; Geology; Rock-mechanics; Models; Computer-models; Statistical-analysis; Risk-analysis; Longwall-mining; Computer-models; Room-and-pillar-mining
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Proceedings of the Second International Workshop on Coal Pillar Mechanics and Design