基于微震和电磁试验系统的煤岩破裂微震测试

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

基于煤岩体破裂产生微震和电磁场的原理,采用自动化伺服压力机、微震和电磁信号接收天线、信号采集系统及信号处理系统等,建立了微震和电磁场测试系统。最后,对某矿区的煤试样进行了实验,结果表明:煤岩体破裂过程中产生阵发式的微震、电磁等脉冲信号,脉冲信号与煤岩体受力密切相关,且微震信号和电磁信号的产生并不同步。电磁辐射信号在受载全阶段均产生,而微震信号仅在煤体破裂时集中产生,这说明电磁信号对煤体变形破坏的敏感性更强。

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.