瞬变电磁法在沉积型铁矿采空区探测中的应用

›› 2019, Vol. 33 ›› Issue (4): 525-527.

瞬变电磁法在沉积型铁矿采空区探测中的应用

张建智

（中国煤炭地质总局地球物理勘探研究院，河北涿州 072750）

收稿日期:2018-09-28 修回日期:2018-11-19 出版日期:2019-08-20 发布日期:2019-08-16
作者简介:张建智（1978-），男，高级工程师，研究方向为综合地球物理勘探。

Application of TEM to Determine the Dimensions of the Abandoned Mine Voids

ZHANG Jianzhi

(Research Institute of Coal Geophysical Exploration, CNACG, Zhuozhou Hebei 072750)

Received:2018-09-28 Revised:2018-11-19 Online:2019-08-20 Published:2019-08-16

摘要/Abstract

摘要： 以山西省平型关某沉积型铁矿采空区的探测试验为例，介绍了地面瞬变电磁法在低品位铁矿采空区探测中的效果。通过岩样电性测试，获得了矿区电阻率参数，综合分析铁矿采空区的瞬变电磁电阻率异常特征,选择发射线框边长为50 m，接收线框为20 m的中心回线装置对已知采空区进行探测试验。通过试验证实，采空区在瞬变电磁中心回线衰减曲线响应、电阻率测深曲线、感应电压多测道曲线及电阻率断面图上均有明显的特征，最终通过电阻率断面图解释了高阻矿体中的不充水采空区边界，为采空区治理提供依据。

关键词: 沉积型铁矿, 采空区, 瞬变电磁

Abstract: This paper presents a case history of applying Transient Electric Magnetics (TEM) method in determine the dimensions of abandoned low content iron mine voids in Pingxingguan Area, Shaanxi Province. The electricity resistivity parameters were obtained by the TEM survey. Since the abnormal TEM characteristics can be detected in the abandoned mine voids, the targeted area was surveyed with a length of 50 meters as the emission TEM signals and the receiving side had a length of 20 meters. It is concluded that the voided area had obvious characteristics on the center loop attenuation curve response, resistivity sounding curve. These abnormal induced voltage multi-track curve and resistivity profile. Finally, the dimensions of the voids were interpreted through the resistivity profile. The boundary of the unfilled area in the high-resistance iron ore body provides a basis for the safety management of the abandoned mine voids.

Key words: fluvial deposited iron mine, abandoned mine space, transient electric magnetics

张建智. 瞬变电磁法在沉积型铁矿采空区探测中的应用[J]. , 2019, 33(4): 525-527.

ZHANG Jianzhi. Application of TEM to Determine the Dimensions of the Abandoned Mine Voids[J]. , 2019, 33(4): 525-527.

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