Research on the technology of composite goaf mining in high gas mines
Xinjiang is extremely rich in coal resources,and with the increasing mining intensity,the compound goaf is also increasing,which increases the difficulty of mining work.Therefore,through the"three zones"distribution law of spontaneous combustion of coal in composite goaf and the numerical simulation calculation of large area of composite goaf,the multiple oxidation and spontaneous combustion characteristics of coal in composite goaf,the nitrogen replacement gas injection in composite goaf,the coupled disaster mechanism of gas and coal fire in composite goaf,as well as the comprehensive prevention and control key technologies,can solve the problem after the working face enters the composite goaf.Accurately identify the coal spontaneous combustion danger area,calculate the safe advancing speed of the working face,realize the safety mining under the thick coal seam,improve the recovery rate of coal resources,and eliminate the coal seam spontaneous combustion caused by multiple oxidation of the residual coal in the compound goaf.
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