Research on the influence of coal and rock mechanic features on EME based on the coupling laws between EME and stress

For the purpose of predicting and controlling dynamical disasters of coal and rock efficiently, the influence of mechanical features of coal and rock on EME during the deformation and fracture of coal or rock is studied on the basis of the coupling laws between EME and stress by using experimental research, theoretical analysis and numerical simulation. The research results show that the mechanical features of coal and rock such as volume modulus, cohesion and internal friction angle around the roadway during the tunnel excavation have a great influence on stress distribution. The distance of peak stress away from coal wall increases with the increase of loading stress and excavation depth, and decreases with the increase of volume modulus, cohesion and internal friction angle. With the decrease of volume modulus, cohesion and internal friction angle of coal and rock around the roadway, the EME signals in the detected place will gradually become weak because of the reduction of the deformation and fracture of coal or rock.So according to the coupling calculated results, by detecting the EME signals we can estimate on the one hand the stress concentration degree and, on the other hand,the danger to dynamical disasters of coal and rock.