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针对煤田火灾发展过程中地磁异常变化特性进行研究。根据自燃煤层过火顶板内传热特性建立了多层梯度烧变地质模型,结合烧变围岩热磁性质建立了煤火二维非均质地层磁异常正演模型。模拟了不同条件下煤火地层局部磁异常剖面,分析了顶板岩性、烧变热特性及燃烧煤层深度对地磁异常的影响。比较结果表明:不同岩性烧变地层的磁异常差异显著,磁异常强度随自燃中心温度升高非线性增加,而深部煤层燃烧产生磁异常强度远小于浅部煤火。
Aiming at the variation characteristics of geomagnetic anomaly during coalfield fire development. Based on the heat transfer characteristics of spontaneous combustion coal seam roof, a multi-layer gradient feldstrom geological model was established. Based on the thermo-magnetic properties of the surrounding rock, a two-dimensional magnetic anomaly forward modeling model was established. The local magnetic anomaly profile of coal-fire stratum under different conditions is simulated. The influence of roof lithology, thermal-combustion characteristics and depth of burned coal seam on geomagnetic anomaly is analyzed. The results show that there are significant differences in magnetic anomalies between different lithology burial strata, and the magnetic anomaly intensities increase nonlinearly with the increase of spontaneous combustion center temperature. However, the magnetic anomaly intensity of combustion in deep coal seams is much smaller than that of shallow coal burners.