Study on Variation Law of Spontaneous Combustion "Three Zones" in Goaf

In order to prevent the coal spontaneous combustion in the goaf of Wenzhuangcun Mine and to determine the region of coal spontaneous combustion oc curred, the meteorological chromatograph was applied to analyze the air samples from the goaf and to determine the max scope of the spontaneous combustion "three zones" in the goaf.The statistics principle was applied to calculate the min region of the spontaneous combustion "three zones".Under the certain conditions and in com bination with the ventilation resistance equation, a formula of natural undertaking scope variation in the goaf was derived.The results showed that the spontaneous com bustion "three zones" of the goaf with the gas drainage gateway and the gateway retained along the goaf would be continuously moved forward with the advancing of th e coal mining face.During the moving forward process, the spontaneous combustion "three zones" scope would be varied from small to large occurred with the replace ment of the connecting gateway and then would be suddenly varied to small and would be steadily varied to large in a circulated and regulated variation.