Abstract
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.
Highlights
In recent years, the large-scale exploitation and utilization of coal resources in China has brought huge economic and social benefits
The overexploitation of coal has formed a large number of mined-out areas underground. e coal mined-out area has led to large-scale surface subsidence
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 transient electromagnetic method (TEM) and controlled source audio-frequency magnetotellurics (CSAMT). en, the borehole detection method is used to verify the goaf range obtained from comprehensive geophysical prospecting
Summary
The large-scale exploitation and utilization of coal resources in China has brought huge economic and social benefits. The overexploitation of coal has formed a large number of mined-out areas (or goafs) underground. E transient electromagnetic method is less affected by topography and has better detection effect on water accumulation in goaf of the coal mine, but it has no obvious response to highresistance anomaly [20,21,22,23]. According to the physical characteristics of different mined-out areas, the main technical way to solve these problems is to adopt the comprehensive geophysical prospecting method with necessary drilling verification. 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 transient electromagnetic method (TEM) and controlled source audio-frequency magnetotellurics (CSAMT). The comprehensive results and the predicted goaf range are analyzed and discussed
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