瞬变电磁法在双层煤矿采空区探测中的应用

Application of Transient Electromagnetic Method in Exploration of Mined-out Area of Double-decked Coal Mine

针对双层煤矿采空区所特有的地质特征,应用纳米瞬变电磁法探测浅埋深煤层采空区,大定源瞬变电磁法探测较深埋深煤层采空区,从而达到同时探测双层煤矿采空区的目的。以实际工程为例,通过试验测线确定工作区煤矿采空区视电阻率值后,结合实测资料与地质情况准确圈定了工作区不同埋深的7号、8号煤层采空区的位置与范围,充分说明了瞬变电磁法(TEM)在不同埋深煤层煤矿采空区的探测方面具有很强的优越性。

Based on the geological features of the mined-out area of double-decked coal mine, nano transient electromagnetic method （TEM） was used to explore the mined-out area of shallow buried coal seam and large fixed loop TEM was used to explore that of deep buried coal seam in order to explore the double-deck at the same time. A real engineering project as an example, apparent resistivity of the mined-out area was determined by testing line with experiment. Combined with testing data and geological condition, the locations and ranges of No.7 and No.8 mined-out area with different buried depth were delineated. The results show that TEM has strong advantages in the exploration of the mined-out area in the coal seams with different buried depth.