Application of Transient Electromagnetic Methods to the Safety Surveying of Coal Mines Production in the Datong Coalfield, China

2021 ◽  
Keyword(s):  
Coal Mine ◽  
Coal Mines ◽  
Electromagnetic Method ◽  
Transient Electromagnetic Method ◽  
Transient Electromagnetic ◽  
Electromagnetic Methods ◽  
Water Hazard

There were a lot of water hazard accidents in coal mines, due to the lacking of effective methods for the coalfield surveying. The transient electromagnetic approach is one of such methods and was applied to examine the safety surveying of coal mine in the Datong coal mines during last two decades. Although there had been many successful cases of using the methods to the surveying of gobs water, meanwhile there were some difficulties to accurately detect and measure the size and location of gob water points, which still need to refine the advance of transient electromagnetic method.

scholarly journals Application of Comprehensive Geophysical Prospecting Method in the Exploration of Coal Mined-Out Areas

2019 ◽  
Vol 2019 ◽  
pp. 1-17
Author(s):  
Xiao Luo ◽  
Shuang Gong ◽  
Zhonggang Huo ◽  
Hongyan Li ◽  
Xinpin Ding
Keyword(s):  
Coal Mine ◽  
Coal Mines ◽  
Electromagnetic Method ◽  
Open Pit ◽  
Transient Electromagnetic Method ◽  
Audio Frequency ◽  
Geophysical Prospecting ◽  
Controlled Source ◽  
Transient Electromagnetic ◽  
Research Profile

Due to the influence of mining technology, some coal mines will leave mined-out areas (or goafs) in the rock mass after mining. If the distribution law and influence scope of mined-out areas cannot be accurately explored and controlled, it will bring great potential safety hazards to subsequent coal mining and cause serious harm to adjacent houses, roads, bridges, railways, and so on. The unmanned aerial vehicle (UAV) aerial survey is used to accurately acquire the three-dimensional model of the slope in the key area of Yuanbaoshan open-pit coal mine, which provides basic information for the real-time visualization of the open-pit mine and the establishment of the engineering geological research profile. And the distribution of mined-out areas and water accumulation in the coal mine are investigated in detail by using the comprehensive geophysical prospecting method of the transient electromagnetic method (TEM) and controlled source audio-frequency magnetotellurics (CSAMT). Then, the borehole detection method is used to verify the goaf range obtained from comprehensive geophysical prospecting, and the results show good consistency. In addition, based on the results of borehole exploration and the comprehensive analysis of the borehole image, the instantaneous water level elevation in goaf and the development height of the water-conducting fracture zone and caving zone are concluded. Finally, the distribution of coal mined-out areas in the exploration area is obtained, and the results show that through the use of the transient electromagnetic method and controlled source audio-frequency magnetotellurics method, combined with drilling detection methods, the purpose of accurate exploration of mined-out areas in coal mines can be achieved.

scholarly journals Application of Comprehensive Geophysical Prospecting Method in Water Accumulation Exploration of Multilayer Goaf in Integrated Mine

2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
Lei Zhang ◽  
Lin Xu ◽  
Yong Xiao ◽  
NingBo Zhang
Keyword(s):  
Coal Seam ◽  
Coal Mine ◽  
Comprehensive Analysis ◽  
High Density ◽  
Electromagnetic Method ◽  
Mine Safety ◽  
Practical Significance ◽  
Time Base ◽  
Transient Electromagnetic Method ◽  
Transient Electromagnetic

A coal mine in Datong is an integrated mine. At present, there is goaf in the upper and lower part of the mining coal seam. There is a lot of ponding in the goaf, which has great potential safety hazards for production. In order to find out the scope and location of ponding in goaf, the comprehensive geophysical exploration method combining transient electromagnetic method and high-density resistivity method is used to carry out the research. Firstly, the time-base, turn-off time, receiving delay, current, superposition times, and other parameters of the instrument are tested on the surface of known goaf to obtain the best instrument parameters, and the parameters are used to verify the feasibility of the research scheme; then, the transient electromagnetic method is used for large-area exploration on the surface of the mine, the suspected goaf ponding area is found through comprehensive analysis, and the high-density resistivity exploration is arranged in the suspected goaf ponding area. According to the obtained results, the scope and location of the goaf ponding area are accurately located through comprehensive analysis. The results show that there are two goaf ponding areas in the exploration area, which are located above the 8# coal seam currently mined; the range and location of goaf ponding area can be accurately obtained by using the comprehensive geophysical method of high-density electrical method and transient electromagnetic method. This method can provide reference for mine water prevention and control in Datong area and has great practical significance to ensure coal mine safety production.

Applications of Electromagnetic Methods in Selecting Ground Sites for Ultra High Voltage Power Plant

2011 ◽  
Vol 354-355 ◽  
pp. 1197-1200
Author(s):  
Xin Gong Tang ◽  
Xing Bing Xie ◽  
Qing Li Chen
Keyword(s):  
Power Plant ◽  
High Voltage ◽  
Electromagnetic Method ◽  
Transient Electromagnetic Method ◽  
Site Location ◽  
Transient Electromagnetic ◽  
Electromagnetic Methods ◽  
Ultra High Voltage

We present a combined electromagnetic method which consist of Audio Magnetotellurics (AMT) and Transient Electromagnetic method (TEM) to the utilize in the selecting sites for ultra high voltage power plant. The inversion profile gives the underground resistivity distribution for the power engineers to select proper ground site location. The result is satisfactory and some ground sites have been established already, indicating that electromagnetic method is suitable for selecting the ground site for ultra high voltage power plant.

Review of Geophysical Exploration on Mined-out Areas and Water Abundance

2019 ◽  
Vol 24 (1) ◽  
pp. 129-143
Author(s):  
Laifu Wen ◽  
Jiulong Cheng ◽  
Shaohua Huang ◽  
Jin Zhou ◽  
Yangchun Han ◽  
...  
Keyword(s):  
Geophysical Methods ◽  
Electromagnetic Method ◽  
Research Progress ◽  
Transient Electromagnetic Method ◽  
Water Abundance ◽  
Geophysical Exploration ◽  
Transient Electromagnetic ◽  
Seismic Methods ◽  
Electromagnetic Methods ◽  
Surface Borehole

With the increase in mining depth, the presence of goafs has become increasingly severe in mine safety. The accurate and effective detection of underground goafs and their water abundance is the key to ensure the safety of mine production. On the basis of the relevant research, this paper defines different goaf types from the perspective of geophysical exploration and discusses the geophysical prerequisites for goaf detection. DC methods, electromagnetic methods, seismic methods, and other geophysical methods on the ground and in the subsurface are reviewed and summarized using the method's principle, research status, and technical features. Research progress on the geophysical methods in goafs and their water abundance detection are introduced, including the electrical source short-offset transient electromagnetic method (SOTEM), the wave-field transformation and synthetic aperture of the transient electromagnetic method, and comprehensive detection. At the end of the paper, a direction for the development of coal mined-out areas and their water abundance detection is put forward, including information fusion technology, ground-airborne electromagnetic methods, magnetic resonance sounding (MRS), surface-borehole transient electromagnetic method, surface-borehole seismic methods, and seismic while tunneling technology. The application prospects of these methods are discussed, and the results of this study are expected to considerably improve the location precision and resolution of the goaf detection on the basis of the implications of these techniques.

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