Observation and Division of Spontaneous Combustion “Three Zones” in Gob of Fully-mechanized Caving Face

Division of spontaneous combustionthree Zonesin 1510 fully mechanized top- coal caving face in Baiyangling Mine was conducted through the actual observation of the float coal status in the gob,the face advance speed and the distribution law of oxygen concentration on the air intake and return side of the gob and according to the division method and index of spontaneous combustionthree zones,and the distribution rule of coal spontaneous combustion three zoneand the danger zone in the gob were kept abreast.The distribution range of the heat radiating zone in 15101 working face was within 10 to 100 m from the gob,and the heat radiating zone on the air intake side was wider due to stronger air leakage.The choking zone was in the deep part of the gob 165 m away from the working face.The depth of the choking zone on air return side was about 137 m.The oxidation temperature- rise zone was the widest on the air intake side of the working face,it was about 55 m.