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1 An efficient approach to numerical simulation of coal mine-related geotechnical issues, by D. P. Adhikary and H. Guo 3 A review of recent experience in modeling of caving, by M. Board and M. E. Pierce  19 Characterization of natural fragmentation using a discrete fracture network approach and implications for current rock mass classification systems, by D. Elmo, S. Rogers, and D. Kennard 29 Three-dimensional modeling of large arrays of pillars for coal mine design, by G. S. Esterhuizen and C. Mark  37 Numerical model evaluation of floor-bearing capacity in coal mines, by M. M. Gadde 47 It is better to be approximately right than precisely wrong: why simple models work in mining geomechanics, by R. E. Hammah and J. H. Curran  55 An overview of calibrating and using the LaModel program for coal mine design, by K. A. Heasley 63 Deep coal longwall panel design for strong strata: the influence of software choice on results, by M. K. Larson and J. K. Whyatt  75 Practical application of numerical modeling for the study of sudden floor heave failure mechanisms, by H. Maleki, C. Stewart, R. Stone, and J. Abshire 89 Advanced numerical solutions for strata control in mining, by A. Studeny and C. Scior  101 UNIT OF MEASURE ABBREVIATIONS USED IN THIS REPORT ft GPa in kg/m km km kPa L/s lb/ft m 2 m 3 m m/t m/sec md mm MPa Mt Mtpa Pa psi tpd foot gigapascal inch kilogram per cubic meter kilometer square kilometer kilopascal liter per second pound per cubic foot meter square meter cubic meter cubic meter per ton meter per second millidarcy millimeter megapascal million tons million tons per annum pascal pound-force per square inch tons per day PROCEEDINGS OF THE INTERNATIONAL WORKSHOP ON NUMERICAL MODELING FOR UNDERGROUND MINE EXCAVATION DESIGN Edited by Gabriel S. Esterhuizen, Ph.D., Senior research engineer, Pittsburgh Research Laboratory, National Institute for Occupational Safety and Health, Pittsburgh, PA. Christopher Mark, Ph.D., P.E., Principal research engineer, Pittsburgh Research Laboratory, National Institute for Occupational Safety and Health, Pittsburgh, PA. Ted M. Klemetti, Research engineer, Pittsburgh Research Laboratory, National Institute for Occupational Safety and Health, Pittsburgh, PA. and Robert J. Tuchman Technical writer-editor, Writer-Editor Services Branch, Division of Creative Services, National Center for Health Marketing, Coordinating Center for Health Information and Service, Centers for Disease Control and Prevention, Pittsburgh, PA.

Proceedings of the International Workshop on Numerical Modeling for Underground Mine Excavation Design.