Abstract
Using the electromagnetic emission of coal-rock testing system, the relation between load change and electromagnetic emission of coal under uniaxial compression was investigated in the laboratory, and the power spectrum density and wavelet energy spectrum coefficients of electromagnetic emission signals were analyzed. The results show that the electromagnetic emission signals are closely related to the deformation and fracture of coal, and their frequencies are positively correlated with crack propagation velocity and crack density and show a trend of first increase, then decrease and final increase; the electromagnetic emission signals are distributed mainly in 50-500kHz band; the energy characteristic of electromagnetic emission signals, which is deduced by the wavelet energy spectrum coefficient method, shows that the signals concentrate in 93.75-750kHz band, and there is a certain correlation between the energy change in 375-750kHz band and the intensity of electromagnetic radiation signals.
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