Monitoring rock burst by electromagnetic emission
冲击矿压危险预测的电磁辐射原理

The Electromagnetic Emission (EME) will be formed because of the formation of cracks and the friction between granules during rock and coal's burst failure. So, EME can be applied to forecast the rock burst in coal mine. Studies show that EME usually becomes stronger with the increase of load and the rate of deformation. EME amplitude is usually below a certain value before the burst failure, while it suddenly increases during the burst failure of the loaded coal specimen. The analysis of elasticity, plasticity, and brittleness model shows that the damage speed of coal and rock is in direct proportion to the EME impulse, the number of acoustic emission (AE), the instant released energy, and the deformation speed. According to the study of the working face with a strong probability of rock burst, the EME can be used to forecast the rock burst and to check the effect of unloading blasting in coal mine.