Field Test Research on Two-dimensional Gas Concentration and Temperature Distribution in the Goaf of Fully Mechanized Caving Face

The gas, oxygen, carbon monoxide and acetylene concentration and the temperature distribution of longwall goaf areas were analyzed by means of burying pipes and temperature sensor. Furthermore, the regulation of “three zones” distribution of 1361 face in Jinyuan colliery by the oxygen concentration and the temperature distribution has been worked out, and the limited velocity of the working face has been marked off. The research results showed that the gas concentration was low intake airflow roadway along goaf towards direction. The goaf gas concentration in return airway was far higher than intake airflow roadway. There was not combustion phenomenon during the test in the 1361 goaf of the coal mining. Meanwhile, the results also confirmed mining extraction process source of gas accumulation in face corner, also can be used for providing the basis of enacting fire prevention measures in the goaf and gas management measures for face corner.