瞬变电磁法勘探煤矿不同层间距双层积水采空区的可行性研究

doi:10.11720/wtyht.2023.1525

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Abstract

It is difficult to explore the overlapping double-layer waterlogged goafs using the transient electromagnetic method. The reason is that upper waterlogged goafs will hinder the propagation of the electromagnetic field, thus prolonging the observation of the lower waterlogged goafs and reducing the signal-to-noise ratio. Besides, the burial depths and layer spacings of double-layer waterlogged goafs affect the signal-to-noise ratio and the observation time of transient electromagnetic signals. By building a double-layer waterlogged goaf model based on the Majiayan coal mine in Shanxi, this study analyzed the electromagnetic field propagation under layer spacings of 25 m, 50 m, 75 m, and 100 m,and calculated the observation time of waterlogged goafs with different layer spacings. Furthermore, it quantitatively characterized the differences between induced voltages in the double-layer waterlogged goafs with different layer spacings using root mean square errors. Additionally, this study proposed the identification criteria for explorable lower waterlogged goafs based on the record errors and noise levels during the observation. The results of physical simulation experiments are as follows: The differences between the induced voltages of double-layered waterlogged goafs with different layer spacings occur mainly in the late stage; the differences between induced voltages gradually decrease as the layer spacing and the burial depth of upper waterlogged goafs increases; the difference between induced voltages is close to the noise level when the layer spacing is greater than 75 m. The actual detection of the double layer waterlogged goaf with a spacing of 75 meters was conducted in Majiayan Coal Mine, and the results showed that the lower waterlogged goaf was not effectively identified.Therefore, It is difficult to effectively explore the lower waterlogged goafs when the layer spacing is greater than 75 m.

Key words： double-layer goaf interlayer spacing transient electromagnetic method response characteristic

Received: 27 October 2022 Published: 27 October 2023

ZTFLH:

P631.325

Corresponding Authors: QI Ting-Ye E-mail: zf320425736@163.com;qty198402@163.com

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	Fan ZHANG
	Guo-Rui FENG
	Ting-Ye QI
	Chuan-Tao YU
	Xin-Jun ZHANG
	Chao-Yu WANG
	Sun-Wen DU
	De-Kang ZHAO

Cite this article:

Fan ZHANG,Guo-Rui FENG,Ting-Ye QI, et al. Feasibility of the transient electromagnetic method in the exploration of double-layer waterlogged goafs with different layer spacings in coal mines[J]. Geophysical and Geochemical Exploration, 2023, 47(5): 1215-1225.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2023.1525 OR https://www.wutanyuhuatan.com/EN/Y2023/V47/I5/1215

Stratigraphy of the study area

Numerical calculation model

Induction voltage decay curve

Apparent resistivity calculation results

Electromagnetic field depth

Root mean square error

Dⁱ values for different time periods

Physical simulation experimental system (a) and front view (b) and top view (c) of the organic glass box

Physical simulation of induction voltage decay curve

Physical simulation of root mean square error

Physical simulation Dⁱ values for different time periods

Survey network layout

Comparison of experimental results with different parameter settings

Inversion of resistivity cross-section by transient electrical sounding

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