Exponential decay law of acoustic emission and microseismic activities caused by disturbances associated with multilevel loading and mining blast
(Key Laboratory of Ministry of Education on Safe Mining of Deep Metal Mines, Northeastern University, Shenyang 110819, China)
Abstract: To investigate decay law of acoustic emission and microseismic activities caused by disturbances associated with multilevel loading and mining blast, a new exponential decay (ED) law was proposed. The results show that the micro-fracture activity decay law after multistage stress loading and blasting disturbance conforms to the ED model, in which the sum of A and n represents the number of initial micro-fracture events, and n represents the level of background micro-fracture events. The ED model can describe the number of initial micro-fracture events with a deviation less than 10%. The ED model outperforms the traditional aftershock models in describing the micro-fracture event decay law in the three cases considered. The ED model can provide a reference for selecting the blasting interval in mines, which is of great significance to maintain the stability of the surrounding rock and ensure safe production in metal mines.
Key words: exponential decay law; blast disturbance; acoustic emission; microseismic activities; metal mine