Microseismic Test of Coal or Rock Burst Based on Microseismic and Electromagnetic Test System

Based on the principle of microseismic and electromagnetic field generated by coal and rock cracking, microseismic monitoring experiment system is established, the experimental system consists of automatic servo press, seismic and electromagnetic signal receiving antenna, the signal acquisition system and the signal processing system, etc. Finally, the coal sample experiments were carried out, the experimental results show that the coal and rock cracking generates episodic seismic, electromagnetic pulse signal; the pulse signal is closely related to the coal and rock stress and microseismic signal and the generation of electromagnetic signals are not synchronized. In the loading full stage, electromagnetic radiation signal is generated; and at the time of coal rupture, microseismic signal is concentrated to produce, this shows that the electromagnetic signal is more sensitive to react the coal deformation and damage.