Study on regularity and mechanism of acoustic emission and electromagnetic emission during fracture process of coal samples
煤样变形破坏声电效应的演化规律及机理研究

In this paper,the characteristics of acoustic emission and electromagnetic emission activity are studied by experiments during the fracture process of different coal samples.Based on the experiment results and the theoretical analysis of microcosmic mechanism of coal fracture,it is considered that the sliding friction between the cracks is the main mechanism of electromagnetic emission during the coal fracture,and the acoustic emission is produced while the cracks expanding,which interpret well the characteristics of acoustic emission and electromagnetic emission activity during the fracture process,and will improve the reliability and accuracy of dynamical disasters forecasting of coal or rock with electromagnetic emission techniques or synthetical methods(acoustic emission,electromagnetic emission).