Characteristics of Electromagnetic Radiation and the Acoustic Emission Response of Multi−Scale Rock−like Material Failure and Their Application

Abstract

In order to explore the evolution characteristics of multi−scale rock−like material failure, we studied the acoustic emission (AE) and electromagnetic radiation (EMR) characteristics of different scale rock−like materials by using the AE−EMR experimental system of coal and rock failure, and the AE and EMR response law of rockburst in mining sites was analyzed. The results show that under uniaxial loading, the stress–strain curve of the specimen has a compaction stage, linear elastic stage, elastic–plastic stage and failure stage. The cumulative AE count, AE energy and stress level of the specimen have an exponential relationship during loading and compression. The cumulative EMR counts of loading and unloading showed a trend of first decreasing and then increasing with the increase in stress level. Electromagnetic radiation and microseismic hypocentral distance show an abnormal change trend when rockburst occurs, and this abnormal phenomenon can be used as a precursor feature signal for rockburst monitoring and early warning.