Abstract:Based on the laboratory experiment,theoretical analysis and numerical simulation,the coupling laws between electromagnetic emission (EME) intensity and stress fields during the deformation and fracture of coal and rock in uniaxial compression are researched in this paper. On the basis of damage characteristics and statistical strength theory of the brittle material like coal and rock,the three dimensional coupling relationship between EME intensity and stress is researched. The relations among the EME intensity,pulse numbers and stress are analyzed theoretically. The theoretical analysis shows that the coupling relationship can be expressed by multinomial approximately. The testing results show that the EME signal increases with stress approximately with the relation of cubic multinomial,the signal of EME emitted in the course of deformation and fracture of coal or rock in compression is relevant to the stress basically,and the intensity and pulse of EME increase with the stress,deformation and fracture. The results of coupling calculation show that the EME signal first increases to a summit value,then decreases suddenly,and it increases also with loading rate and strength of coal and rock,which is consistent with the experimental results.