Study on the Distribution Law of Spontaneous Combustion Three Zones in Goaf of Shallow Buried Extra-thick Coal Seam
39204 working face of No.3 Mine of China Coal Pingshuo was taken as the research object,and the distribution characteristics and minimum advance speed of"three zones"of spontaneous combustion in goaf were stud-ied based on the oxygen concentration classification standard through the combination of on-site monitoring,numerical simulation,theoretical analysis and other means.The results showed that the distribution range of the three zones of spontaneous combustion in the goaf obtained from on-site monitoring was similar to the numerical simulation test re-sults,with relatively small errors.The lengths of the heat dissipation zone,spontaneous combustion zone,and suffo-cation zone in the intake airway were above 0～31.5,31.5～80 and 80 meters.The lengths of the heat dissipation zone,spontaneous combustion zone,and suffocation zone in the return airway were above 0～20.5,20.5～55.9 and 55.9 meters.It was calculated that the daily advance length of the 39204 working face should be greater than 1.02 meters,and the monthly advance length should be greater than 30.6 meters.
Shallow buried extra-thick coal seamThree zones of spontaneous combustion in goafOxygen con-centrationAdvance length
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