The Simulation Research of Electromagnetic Wave Attenuation Coefficient Tomography in Media of Complicated Fault Structures
Received date: 2012-07-09
Revised date: 2013-01-02
Online published: 2013-03-10
Traditional mine electromagnetic wave perspective tomography techniques only consider the propagation distance while ignoring the directionality of transmission which causes the resolution of tomographic imaging to be lower in the detection of complex structure. According to the propagation law of electromagnetic waves in coal medium, a new amplitude attenuation constant involving incidence angle is deduced in this paper. Base on the algebraic reconstruction algorithm, tomography mathematical model is built by introducing the new amplitude attenuation constant, and the software is compiled. The new method is used to do simulation for parallel faults models and cross faults models respectively. By comparison with the traditional method, the results show that the improved amplitude attenuation constant has better effect and it can accurately and clearly indicate position, trend and extension length of complicated fault structures. In addition, the results also show that absolute attenuation tomography method is much more superior to the relative attenuation tomography method in case of attenuation value of media background not being easy to be determined. The resolution of parallel faults is higher than that of cross faults. Finally, a successful example of locating a hidden parallel faults in a coal working face indicates that the effect is enhanced a lot by adopting the improved attenuation constant tomography technique.
Key words： Fault structures; Electromagnetic wave; Attenuation constant; Tomography.
Liu Xinming , Liu Shucai , Yi Hongchun , Yang Guang , Liu Ying . The Simulation Research of Electromagnetic Wave Attenuation Coefficient Tomography in Media of Complicated Fault Structures[J]. Advances in Earth Science, 2013 , 28(3) : 391 -397 . DOI: 10.11867/j.issn.1001-8166.2013.03.0391
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