Study on characteristics of electromagnetic emission during excavation in Chengzhuang mine

Electromagnetic emission (EME) signals produced by coal and rocks during excavation in Chengzhuang mine were measured with the KBD7 electromagnetic emission monitoring equipment. Analyzed the relationships between electromagnetic emission signals and excavation, ground behavior. The research shows that the electromagnetic emission is produced in the course of excavation, which is the result of the stress redistribution or deformation and fracture of coal and rocks tending to a new balance when affected by excavation. The electromagnetic emission technology can be used for monitoring deformation and fracture of workings during excavation.