Abstract
geological hazard in deep underground mining. Before the rock mass explosion, electromagnetic energy will radiate outward during the deformation and rupture of the coal rocks. Hence, it is possible to use the electromagnetic radiation to predict geological disasters in coal mines. A challenging task using the active source electromagnetic survey technique is to detect geological anomalies, such as disaster water sources and geological structures. To this end, this paper proposes a new electromagnetic radiation solution based on the forward and inversion theory to detect geological anomalies in the coal seam. Based on typical coal mine geological models, the forward modelling and inversion modelling have been performed, respectively. The forward modelling explained the geological anomalies inside the coal seam, which were very sensitive to the response of the radiated electromagnetic field; especially, for the water-bearing geological anomalies. The inversion modelling discovered that the inversion geo-electric parameter distribution agreed well with the actual model. As a result, the proposed method is feasible for geological anomalies detection.
Highlights
Electromagnetic waves are used to detect the obscured and remote regions based on the imaging techniques [1]–[7]
As an effective geophysical monitoring method, the electromagnetic radiation technology has been applied to most mines with serious rock burst in China [12], e.g., rock burst prediction [13]
The burst degree of the coal rock mass can be predicted using the characteristics of the electromagnetic radiation field
Summary
Electromagnetic waves are used to detect the obscured and remote regions based on the imaging techniques [1]–[7]. The intensity of electromagnetic radiation reflects the stress and burst degree of the coal rock mass and the amount of pulses mainly reflects the rock cracks [14]. The burst degree of the coal rock mass can be predicted using the characteristics of the electromagnetic radiation field. The problem is that it cannot accurately locate the area of rock fracture For another example, the electromagnetic geophysical methods are employed to detect geological anomalous structures and disaster sources of water [15]–[17]. According to the Maxwell theory, the responses of high frequency electromagnetic waves are mainly associated with medium permittivity [18], which is very sensitive to bearing of coal rock [19]. Numerical analysis results demonstrate that the electromagnetic inverse scattering is effective to locate disaster water source
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