Displacement change of spontaneous combustion"three zones"in goaf under repeated mining of extra-thick coal seam
In order to study the effect of repeated mining on the distribution characteristics of the"three zones"of coal spontaneous combustion(CSC)in the goaf of extra-thick coal seam,field measurements were carried out on the 222 working face of Xiashijie Coal Mine in Tongchuan,and the distribution on the"three zones"was determined based on the tube bun-dle monitoring system.Then,Fluent software was utilized to simulate the dynamic distribution of oxygen concentration in the goaf under repeated mining and single mining,respectively.Under repeated mining,the measured results in the goaf were in general agreement with the numerical simulation results.Compared with the single mining simulation results,the repeated mining resulted in a shortening of the heat dissipation zone and oxidation zone in the goaf.In addition,the heat dissipation zone on the inlet side moved forward by 6.8％,and the oxidation zone moved forward by 7.0％;and 14.3％forward shift of the heat dissipation zone and 11.3％forward shift of the oxidation zone on the outlet side.The research results provide a ba-sis for the prevention and control of CSC dangerous areas in goaf under repeated mining.
extra-thick coal seamrepeated mininggoafspontaneous combustion"three zones"fire prevention and control technology
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