Experimental study on the microwave radiation precursor laws of loading coal in deformation and fracture process

The effect and laws of microwave radiation of coal samples under uniaxial compression are experimentally studied and theoretically analyzed. Experiment results show that loading coal samples have the microwave radiation effect under the condition of uniaxial compression and accordingly in the frequency band of 6. 6 GHz, and the microwave radiation precursors indicating the failure of loading coal have 3 types. Based on the dielectric physics the phenomena in the experiment are explained scientifically and rationally. The brightness temperature vary maximum value of the coal under the uniaxial compression condition is 1. 9 to 2. 7 K, which shows that the microwave radiation effect is superior to the infrared radiation effect. With principles of microwave remote sensing, the influent factors on the microwave emission effects of the loading coal samples are analized. Study results show that the microwave radiation precursor laws of loading coal make the microwave remote technology have a more widespread application prospect to predict the dynamic catastrophe of coal.