Study on spontaneous combustion in Gob of fully mechanized mining with top coal caving face

Characteristic of spontaneous combustion in the gob of fully mechanized top-coal carving face is special.According to the gob of fully mechanized top-coal carving face,850 meters in carving depth,in Gucheng coal mine of Shandong Dongshan Mining Group,the temperature changing process in the gob has been observed for 92 days with fiber grating temperature sensors.Meanwhile,in the place where we lay temperature sensors,another four gas sampling beam tube have been fixed to analyze the gas ingredient in the gas sample.The variability zone and the instability zone of oxygen concentration and temperature in the entire gob have been elicited.In addition,the analysis has been made on rules of the high temperature and low oxygen zone,which can guide preventing and controlling coal self-ignition and promote work safety.