含水采空区全空间瞬变电磁响应分析

doi:10.11720/wtyht.2021.1443

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Abstract

Aiming at tackling the problem of whole-space transient electromagnetic response signal identification in water-bearing goaf and based on induced electromotive force (EMF)-apparent resistivity and time-depth conversion relationship, the authors obtained the spatial distribution law of apparent resistivity with depth variation of the whole sector by using the finite element numerical simulation and field measurement method, extracted the EMF attenuation curve of the measuring point in the low resistance abnormal area, and calculated the voltage rise amplitude of the measuring point varying with the detection angle. Based on the above research, the authors carried out the drilling verification and borehole peeping, and analyzed the content of the drilling water samples. The results show that the transverse angle consistency of transient electromagnetic response of water-bearing goaf is higher than that of vertical depth, and the rising amplitude of EMF in the abnormal region of low resistance is opposite to the difference of induced voltage, which shows a sharp increase in the initial stage of secondary field observation followed by slowing down, reaching more than 10 times on the whole. Drilling engineering and geochemical exploration analysis further verify the geophysical exploration results.

Key words： water-bearing goaf whole-space transient electromagnetic method finite element simulation voltage rise amplitude drilling geochemical exploration

Received: 08 September 2020 Published: 29 April 2021

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	Articles by authors
	Jian-Qiang CHEN
	Yan-Chuan LI
	Hao TIAN
	Han-Chao LI

Cite this article:

Jian-Qiang CHEN,Yan-Chuan LI,Hao TIAN, et al. Whole-space transient electromagnetic detection of water-bearing goaf[J]. Geophysical and Geochemical Exploration, 2021, 45(2): 546-550.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2021.1443 OR https://www.wutanyuhuatan.com/EN/Y2021/V45/I2/546

Diagram of finite element model

EMF simulation results of measuring points in water bearing goaf

Spatial electrical simulation results of water bearing goaf

Simulation of EMF change of secondary field in water bearing goaf

Measured results of spatial electrical properties of water bearing goaf

Measured EMF of secondary field and its attenuation characteristics in water bearing goaf

Drilling design diagram

Drilling peep results

Superposition of drilling geophysical exploration results

	离子	浓度/(mg·L^-1)	占比/%
	K⁺	8.71	0.67
	Na⁺	216	28.29
阳离子	Ca²⁺	112	16.87
	Mg²⁺	217.6	53.96
	Fe³⁺	1.27	0.21
	Cl^-	50.35	7.79
	$HCO 3 -$	420	37.83
阴离子	$CO 3 2 -$	0	0
	$SO 4 2 -$	473.9	54.24
	$NO 2 -$	1.19	0.14

Ion concentration of water sample

[1]	钟声, 王士党. 地面与井下瞬变电磁法联合探测煤矿富水区域[J]. 物探与化探, 2016,40(3):635-638.
[1]	Zhong S, Wang S D. The application of combined ground and underground coal mine transient electromagnetic methods to the exploration of water-rich area[J]. Geophysical and Geochemical Exploration, 2016,40(3):635-638.
[2]	丁亮斌, 李铁亮. 小煤窑采空积水区的探查方法[J]. 煤矿安全, 2019,50(5):150-152.
[2]	Ding L B, Li T L. Method for finding out water accumulation area in small coal mine[J]. Safety in Coal Mines, 2019,50(5):150-152.
[3]	刘百祥, 鲜鹏辉, 仇念广. 瞬变电磁法在探查工作面上覆煤层采空区富水性中的应用[J]. 煤矿安全, 2020,51(4):137-141.
[3]	Liu B X, Xian P H, Qiu N G. Application of transient electromagnetic method in detecting water richness in goaf of overburden coal seam at working face[J]. Safety in Coal Mines, 2020,51(4):137-141.
[4]	易洪春. 地—井瞬变电磁响应特征研究[J]. 物探与化探, 2018,42(5):970-976.
[4]	Yi H C. Research on response of ground-borehole TEM[J]. Geophysical and Geochemical Exploration, 2018,42(5):970-976.
[5]	张永超, 贾新果, 陈凯, 等. 瞬变电磁法探测超高水材料注浆治理采空区效果[J]. 煤炭科学技术, 2017,45(3):174-178,100.
[5]	Zhang Y C, Jia X G, Chen K, et al. TEM inspecting of goaf treatment effect with grouting super high water material[J]. Coal Science and Technology, 2017,45(3):174-178,100.
[6]	王鹏, 程建远, 姚伟华, 等. 积水采空区地面-钻孔瞬变电磁探测技术[J]. 煤炭学报, 2019,44(8):2502-2508.
[6]	Wang P, Cheng J Y, Yao W H, et al. Technology of detecting water-filled goaf beside borehole using downhole transient electromagnetic method[J]. Journal of China Coal Society, 2019,44(8):2502-2508.
[7]	于景邨, 常江浩, 苏本玉, 等. 老空水全空间瞬变电磁法探测三维数值模拟研究[J]. 煤炭科学技术, 2015,43(1):95-99,103.
[7]	Yu J C, Chang J H, Su B Y, et al. Study on whole space transient electromagnetic method prospect three dimensional numerical modeling of gob water[J]. Coal Science and Technology, 2015,43(1):95-99,103.
[8]	牟义. 典型地质异常体电磁法响应特征研究[J]. 煤矿开采, 2017,22(4):4-9.
[8]	Mu Y. Study of electromagnetic response characteristics of typical geological anomalous body[J]. Coal Mining Technology, 2017,22(4):4-9.
[9]	牟义, 李江华, 徐慧, 等. 矿井瞬变电磁法参数优化试验及超前探测应用[J]. 煤炭科学技术, 2020,48(6):184-190.
[9]	Mu Y, Li J H, Xu H, et al. Parameters optimization test of mine transient electromagnetic method and application of advanced detection[J]. Coal Science and Technology, 2020,48(6):184-190.
[10]	陈健强, 张永超, 邱浩, 等. 井下富水区瞬变电磁响应特征分析[J]. 煤矿安全, 2019,50(10):185-189.
[10]	Chen J Q, Zhang Y C, Qiu H, et al. Transient electromagnetic response characteristics of mine water-rich area[J]. Safety in Coal Mines, 2019,50(10):185-189.
[11]	邱浩, 郝宇军, 陈健强. 煤矿采空区瞬变电磁超前探测波场成像研究[J]. 煤炭工程, 2020,52(2):56-58.
[11]	Qiu H, Hao Y J, Chen J Q. Wave field imaging system in advance detection of watery goaf using mine transient electromagnetic method[J]. Coal Engineering, 2020,52(2):56-58.
[12]	于景邨, 胡兵, 刘振庆, 等. 矿井瞬变电磁探测技术的应用[J]. 物探与化探, 2011,35(4):532-535.
[12]	Yu J C, Hu B, Liu Z Q, et al. The application of mine transient electro-magnetic detection technology[J]. Geophysical and Geochemical Exploration, 2011,35(4):532-535.
[13]	黎灵. 强水力联系采空水害补给综合判定技术[J]. 煤矿开采, 2018,23(4):93-96,32.
[13]	Li L. Comprehensive judgement method of goaf water disaster alimentation under strengthen hydraulic connection[J]. Coal Mining Technology, 2018,23(4):93-96,32.