1.School of Safety Engineering, China University of Mining and Technology, Xuzhou , China;2.School of Architecture andEnvironment, Ningxia Institute of Science and Technology, Shizuishan , China;3.MOE Key Lab of Coal Mine Gas and Fire Preventionand Control, China University of Mining and Technology, Xuzhou , China

针对淮北矿区杨柳煤矿岩浆岩床下伏高瓦斯煤层易自燃的现状，通过试验测试、数值模拟等方法对其采空区煤自燃致灾机制进行研究。结果表明：岩浆侵入的热变质作用使煤层的变质程度增加，在一定程度上降低了煤层自燃倾向性；开采期间，岩床起到关键层作用，导致岩床下伏煤岩体离层裂隙发育，采空区压实程度降低，孔隙率和渗透率明显增大；较大的孔隙率和渗透率使采空区漏风增大，氧化带范围扩大。在此基础上，构建了适合该地质条件下的综合防灭火技术方案，有效防治了杨柳煤矿采空区遗煤自燃。

Aiming at the status of spontaneous combustion of high gas coal seam under the magma rock bed of Yangliu Coal Mine in Huaibei Mining Area, the mechanism of spontaneous combustion of coal in goaf is studied by means of experimental tests and numerical simulation. The results showed that the thermal metamorphism of magma intrusion increased the degree of metamorphism of the coal seam, reduced the ability of the coal seam to absorb oxygen by 1.09%, and reduced the tendency of spontaneous combustion. During the mining period, the rock bed plays a key stratum, resulting in the separation fissure development of the rock mass under the rock bed. The degree of compaction in the goaf was reduced, the maximum porosity was about 1.55 times that of no bed cover, and the maximum permeability was about 6.88 times. The larger porosity and permeability made the goaf increase,and the oxidized zone was expanding. On this basis, a comprehensive fire prevention technical scheme suitable for the geological conditions was constructed, which effectively prevented the spontaneous combustion of the residual coal in the goaf of Yangliu Coal Mine.