Characteristics of the Gas Emission Rate Based on the Monitoring Data in the Fully-Mechanized Working Face

The relation of gas emission,the two factors of the roof weighting and the advancing speed of working face are analyzed by the method of mathematical statistics according to the airflow and gas monitoring data for No.15158 longwall panel of Tucheng coal mine in Panjiang Coal Group.The result shows that the average of absolute gas emission rate of the working face closes to the cutting speed of the shearer.The overall average gas emission rate increases with the speed of the periodic progress per shift.The gas concentration presents three areas corresponding to the initial mining,normal mining and finishing work.Furthermore,there is a negative power function relation between the average of absolute gas emission rate and production per shift.The gas peak and uneven emission are mainly caused by the periodic roof weighting.