磁异常划分煤岩火区机理及应用

为研究高温烘烤过后煤岩混合物的磁性变化规律，对磁法探测技术在火区范围探测提供指导，利用磁化率测定系统测定了纳林庙煤和岩石不同比例混合后煤岩混合样的磁化率，通过研究温度、粒径、磁场强度和煤岩比对样品磁化率的影响。结果表明：在常温～600℃整体范围内烘烤形成的烧变煤岩混合样的磁化率整体上随温度增高而增大，随外界磁感应强度变大而减小。烘烤温度小于400℃时，样品粒径越小磁化率越大|通过X射线衍射实验分析了高温烘烤对煤岩混合样成份与结构的影响，表明高温烘烤的过程中，赤铁矿和黄铁矿含量增加是引起磁化率升高的主要原因。最后，采用GEM系统公司的GSM-19T型质子磁力仪对纳林庙煤矿二号井重点区域进行了火区探测，圈定磁异常范围，在磁异常区域通过钻孔测温进行验证。

Research and Application of the Mechanism of Magnetic Anomaly Division of Coal and Rock Fire Zone

In order to study the magnetic changes of coal-rock mixtures after high-temperature baking, it provides effective guidance for the application of magnetic methods in the delineation of fire zones. The magnetic susceptibility measurement system was used to determine the Nalinmiao coal. The magnetic susceptibility of coal-rock mixed samples mixed with different proportions of rock was studied respectively. The influence of temperature, particle size, magnetic field strength and coal-rock ratio on the magnetic susceptibility of the samples were studied. The results show that the magnetic susceptibility of the burnt coal-rock mixed sample formed in the whole range of normal temperature to 600 ℃ increases with the increase of temperature and decreases with the increase of the external magnetic induction intensity. When the baking temperature is less than 400 ° C, the smaller the particle size of the sample, the greater the magnetic susceptibility; the effect of high temperature baking on the composition and structure of the rock is analyzed by X-ray diffraction experiments, indicating that during the high temperature baking of the rock, Increased hematite and pyrite content is the main cause of increased susceptibility which is the main reason for the enhanced magnetic properties of sintered rocks compared to room temperature rocks. Finally, the GEM system company's GSM-19T proton magnetometer was used to detect the fire area in the key area of Nalinmiao Coal Mine No. 2 shaft. The comprehensive analysis was used to determine the suspected fire area, and the borehole temperature measurement was used to verify the magnetic detection. Fire zone reliability.