瓦斯与煤自燃共存研究(Ⅰ):致灾机理

Study on the coexistence of gas and coal spontaneous combustion(Ⅰ):disaster mechanism

调研了我国主要矿区229对矿井的瓦斯与煤自燃灾害现状,其中74对具有瓦斯与煤自燃共存的灾害,且随着开采深度增加,此类复合灾害的矿井数具有增多的趋势。为此,研究了瓦斯与煤自燃共存的内在关联性及致灾机理,提出裂隙场、CH4浓度场、O2浓度场和温度场4场交汇是致灾充要条件;建立了典型煤岩体裂隙场中气体运移数学模型,并结合实例定量分析了N2,O2,CH4的体积分数与运移速度关系;剖析了瓦斯与煤自燃共存灾害的案例,验证了多场交汇致灾机理。

The investigation of gas and coal spontaneous combustion in 229 coal mines of main mining areas in China shows that 74 mines suffer from the coexistence of gas and spontaneous combustion of coal,the number of which has a increasing trend with the mining depth growing.So the coal disaster mechanism caused by the coexistence of gas and spontaneous combustion was studied,which proved that disasters arise only from the intersection area of CH4,O2 and heat in cracks.What＇s more,the mathematical model of multi-gas migrating in cracks was built upon definite data,establishing the relationship between mass concentration and velocity of gases such as N2,O2 and CH4.At last,typical disaster cases in coal mines was analyzed to verify the practicability of disaster mechanism of gas and coal spontaneous combustion coexistence.