TY - JOUR N2 - In longwall absolute methane emission rate forecasting, the range of the destressing zone is determined empirically and is not considered to be dependent on the geomechanical parameters of the rock strata. This simplification regarding destressing zone determination may result in significant differences between the forecast and the actual methane emission rates. During the extraction of coal seams using a system involving longwalls with caving under the conditions of low rock mass geomechanical parameters, the absolute methane emission rate forecasts are typically underestimated in comparison to the actual methane emission rates. In order to examine the influence of the destressing zones on the final forecasting result and to assess the influence of the rock mass geomechanical parameters on the increased accuracy of forecast values, destressing zones were determined for three longwalls with lengths ranging from 186 to 250 m, based on numerical modelling using the finite difference method (FDM). The modelling results confirmed the assumptions concerning the upper destressing zone range adopted for absolute methane emission rate forecasting. As for the remaining parameters, the destressing zones yielded great differences, particularly for floor strata. To inspect the accuracy of the FDM calculation result, an absolute methane emission rate forecasting algorithm was supplemented with the obtained zones. The prepared forecasts, both for longwall methane emission rates as well as the inflow of methane to the longwalls from strata within the destressing zone, were verified via underground methane emission tests. A comparative analysis found that including geomechanical parameters in methane emission rate forecasting can significantly reduce the errors in forecast values. L1 - http://www.journals.pan.pl/Content/117226/PDF/Archiwum-65-3-13-Wierzbinski.pdf L2 - http://www.journals.pan.pl/Content/117226 PY - 2020 IS - No 3 EP - 664 DO - 10.24425/ams.2020.134139 KW - methane hazard KW - methane emission rate forecasting KW - FDM simulations KW - numerical modeling KW - destressing (desorption) zone A1 - Walentek, Andrzej A1 - WierzbiƄski, Krystian PB - Committee of Mining PAS VL - vol. 65 DA - 2020.08.31 T1 - Influence of Rock Geomechanical Parameters on Increased Longwall Absolute Methane Emission Rate Forecasting Accuracy SP - 641 UR - http://www.journals.pan.pl/dlibra/publication/edition/117226 T2 - Archives of Mining Sciences ER -