大定源回线装置瞬变电磁法在浅层煤矿采空区勘查中的应用

Application of Transient Electromagnetic Sounding Method with Large Fixed Source Loop Device in Shallow Coal Mined out Area

摘要:

煤矿采空区土地已成为可持续发展的重要资源，浅层煤矿采空区探测在城市规划中显得日益重要。本文采用大定源回线装置瞬变电磁法对浅层煤矿采空区进行勘查，结合具体工程案例选用合理的施工参数，对野外采集数据进行视电阻率计算并绘制成图，利用视电阻率等值线扰动异常圈定采空区位置，指导钻孔布设，解译成果与地质资料及钻孔揭露地层基本吻合。实践证明，大定源回线装置瞬变电磁法在浅层煤矿采空区探测中具有明显效果，在其他浅层采空区勘查中有着广泛的应用前景。

Abstract:

Land in coal minedout area has become an important resource for sustainable development. Detection in shallow coal minedout area is becoming increasingly important in urban planning. In this paper, by using the large fixed source loop device transient electromagnetic sounding method, shallow coal minedout area has been explored. Combining with specific project, reasonable construction parameters are selected, and the field collected data are processed and mapped. The location of coal minedout is determined by disturbance of apparent resistivity isoline, and the result of interpretation is consistent with relevant geological data and strata exposed by borehole. It is proved that the transient electromagnetic sounding method with large fixed source return line device has obvious effect in the detection of shallow coal mine goaf, and has a wide application prospect in other shallow goaf exploration.