Control actions of structural curvature of coal-seam floor on coalbed gas in the No.8 Coal Mine of Pingdingshan

Based on the geological background analysis of the No.8 Coal Mine of Pingdingshan, the relationships between coalbed gas content and burial depth were uncovered, and controls of faults on coalbed gas were discussed. Quantificationally calculated structure curvature of contour of coalbed floor, and analyzed its correlations with the measured coalbed gas content of exploratory boreholes, relative gas emission rate, outburst gas amount, and outburst coal amount. The results show that structure curvature is negatively related to coalbed gas content, relative gas emission rate, outburst gas and coal amounts which reflect No.15 coalbed of Ji is above the neutral plane of folds. That is, the No.15 coalbed of Ji Group is compressed in incline and is tensed in anticline, and the higher structure curvature is, the higher stress is.