An updated empirical model for ground control in U.S. multiseam coal mines

Multiple seam interactions are a major source of ground instability in several U.S. coalfields. Empirical methods are well suited for this problem, because while the mechanics multiple seam interactions are very complex and poorly understood, many mining case histories are available for analysis. This study makes use of an updated database that includes 356 multiseam case histories, including 67 unsuccessful designs. The paper describes in detail the process used to design the study, collect the data, conduct the statistical analysis, and develop the quantitative model. The model can be used for mine planning in multiple seam situations, and has been made available as a module within the Analysis of Coal Pillar Stability(ACPS) computer program.