磁异常划分煤岩火区机理及应用  

Mechanism and application of coal-rock fire zone division based on magnetic anomalies

作　　者：张辛亥[1,2] 窦凯 李经文 李勋广 程望收 朱辉 ZHANG Xin-hai;DOU Kai;LI Jing-wen;LI Xun-guang;CHENG Wang-shou;ZHU Hui(Key Laboratory of Western Mine and Hazard Prevention,Ministry of Education of China,Xi’an 710054,China;School of Safety Science and Engineering,Xi’an University of Science and Technology,Xi’an 710054,China)

机构地区：[1]西部矿井开采及灾害防治教育部重点实验室,陕西西安710054 [2]西安科技大学安全科学与工程学院,陕西西安710054

出　　处：《煤炭工程》2021年第3期135-139,共5页Coal Engineering

摘　　要：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。In order to study the magnetic change law of coal-rock mixture after high temperature baking,and guide the magnetic detection of fire zone range,the magnetic susceptibility measurement system is used to test the sample of Nalinmiao coal and rock mixed at different proportion,to study the influence of temperature,particle size,magnetic field intensity and the coal-rock proportion on the magnetic susceptibility.The results show that,for the samples baked in room temperature to 600℃,the magnetic susceptibility of is positively related to temperature and negatively related to magnetic induction intensity.When the baking temperature is below 400℃,the susceptibility is negatively related to particle size.The influence of high temperature baking on the composition and structure of coal and rock mixture is analyzed in X-ray diffraction experiment,which shows that the increase of hematite and pyrite content is the main reason for the rise of magnetic susceptibility during high temperature baking.Finally,the magnetic anomaly scope was determined of No.2 mine of Nalinmiao Coal Mine using GSM-19T proton magnetometer,and the result was verified through temperature measurement of drilling.

关 键 词：煤岩混合样 火源探测 磁化率 煤田火灾 

分 类 号：TD75[矿业工程—矿井通风与安全]