Application of the multi-excitation source transient electromagnetic method in the coal mine goaves
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摘要: 大定源回线是瞬变电磁方法的常用装置,移动发射框需要耗费巨大的人力和时间,极大降低了工作效率;电性源瞬变电磁法具有探测深度大、受地形限制小、工作效率高等优点,但偏移距较大时,采集信号强度衰减强烈,信噪比降低,在一定程度上限制了探测精度。为了解决精细地质探测的实际问题,采用多激励源瞬变电磁方法,通过构建正演模型,以甘肃魏家地煤矿含水采空区探测为例,比较了传统大定源回线、单激励源及多激励源电性源瞬变电磁的勘查效果;经钻孔验证,多激励源瞬变电磁法在研究区勘查效果更好。研究结果为邻区及类似地区煤矿采空区探测提供了技术支撑和可供参考的范例。Abstract: The large fixed-source loop is a commonly used device in the transient electromagnetic method (TEM). However, moving its transmitter requires a lot of manpower and time, greatly reducing the efficiency of the method. The electrical source TEM enjoys the advantages of large detection depth, less terrain restriction, and high efficiency. However, its signal intensity severely attenuated and it has a low signal-to-noise ratio in the case of a large offset, which limit its detection precision to a certain extent. To achieve high-precise geological exploration, this study built a forward model using the multi-excitation source TEM. With the detection of a water-bearing goaf of the Weijiadi coal mine in Gansu Province as a case study, this study compared the exploration performance of the multi-excitation source TEM with that of the conventional large fixed-source loop and the single-excitation source TEM. As verified by drilling, the multi-excitation source TEM can deliver better exploration performance in the study area. The results of this study can provide technical support and a reference for goaf detection in adjacent and similar areas.
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