Prevention and Control Technology of Coal Spontaneous Combustion at Fully Mechanized Caving Face of Steep-inclined and Extra-thick Coal Seam

Aiming at the spontaneous combustion condition in the gob of the 5521-15 mining face,the key factor of spontaneous combustion occurred in the gob was discussed.The comprehensive control measures of coal spontaneous combustion were put forward by using primarily big flow perfusion three-phase foam to cover widely float coal,taking complementally pressure balancing plugging and acceleration of working speed,which effectively controlled the spontaneous combustion of 5521-15 fully mechanized caving face and ensured the safety mining.