Temporal and spatial distribution characteristics and key influencing factors of gas emission in coal seam with low gas content by high intensity mining

The gas emission is affected by many factors, in order to study the temporal and spatial distribution characteristics and key influencing factors of gas emission in fully mechanized working face of coal seam with low gas content by high intensity mining, by means of field measurement, the gas concentration distribution characteristics and the effects of coal production, air supply amount, mine pressure, advancing speed in the working face and coal seam gas content on gas emission in production and repair classes in fully mechanized working face of coal seam with low gas content by high intensity mining are studied. The results show that the gas concentration in the working face of the production class is greatly affected by the high concentration gas in the air leakage flow in goaf, the gas concentration in the working face of production class is mainly affected by the gas released from coal mining; the gas emission from coal wall of the working face accounted for 75.17%, and the goaf accounted for 24.83%; through the study of different influencing factors, it is concluded that the coal production and the advancing speed of the working face are the key factors that affect the gas emission in fully mechanized working face of coal seam with low gas content by high intensity mining.