TEM大回线装置在煤矿浅层采空区中的应用

采用大回线装置，配合高频率和大电流发射系统，同时结合正反演技术，对资料进行相应的处理与解释，发现大发射回线框瞬变电磁法在一定条件下是可以解决浅层采空区探测的物探方法。参考黄陵地区煤矿采空区埋深较浅的情况，结合实际地层电性特征，设计理论模型，通过正反演计算，得到的效果良好，对异常的反映较为灵敏。并结合在黄陵地区某煤矿采空区探测中的实际应用，通过对瞬变电磁数据的原始资料分析，结合正演模型进行全域计算和反演计算，分析对比两种计算方法与实际地层电性的一致性，得到反演计算的结果与钻探验证情况相符合，为后期采空区治理和工程项目的安全建设起到了很好的指导作用，表明该种数据处理与解释方法是切实有效的。 

APPLICATION OF LARGE LOOP CIRCUIT OF TRANSIENT ELECTROMAGNETIC METHOD (TEM) IN SHALLOW GOAF OF COAL MINE

Large loop circuit, combined with high frequency and high current emission system, together with forward and backward modeling, is a useful geophysical prospecting to detect the shallow goaf in coal mines under specific conditions. The goaf in Huangling coal mine is shallow, a theoretical model which is designed based on the actual strata electrical characteristics acquired a good result through forward and backward modeling, sensitive to the anomalies. Application of this method on one coal mine in Huangling area returns a result consistent with the actual strata electrical characteristics, and verified by drilling. It provides a good method for managing the goaf after the mining activities.