Bulking Based Porosity Method to Predict Floodable Volume of Longwall Gob

Abstract The floodable volume of longwall gob can be great importance in developing accurate coal mine operation plans, particularly for water management and environmental control strategies. Given the inaccessibility difficulty direct measurement characteristics following recompression, hydrologic, geomechanical, spatial data principles were used to solve porosity height residual using a mathematical model framework bulking-based techniques. Based on this approach, Appalachian longwalls appears tighter than previously reported, ranging between 4.99 14.31%. Residual height, as normalized with respect extraction ranges 1.90 2.45. A novel, bedding-based bulking approach is ampliative existing roof caving fundamentals, it has greater explanatory value compared traditional, lithologic-based application. efficacy determined by examined causal comparative method, whereby time series prediction historical groundwater rebound observed pool elevation data. Prediction accuracy significantly improved prototype calculate void gob, specifically, dependence material upon width overburden depth ratio movement basins subcritical critical panel widths. potential implication these findings toward ventilation studies could significant.