Coal Experimental Study On Forced Vibration Response And Fracture Characteristics

This paper adopts theoretical analysis, experiment research and numerical simulation methodto research the influence law of vibration that accelerated and frequency of coal is stressed bydynamic response and fracture characteristics. According to the theory of vibration mechanics andstructure dynamic performance, the coal and rock specimens are analyzed the influence factors ofnatural vibration frequency and dynamic response. Based on the theoretical analysis, build anacquisition system structures forced vibration simulating experiment, which vibrated experimentof coal specimen. Using the entirety empirical mode decomposition (EEMD) reconstructed therupture of coal microseism signals and the effective electromagnetic radiation signals. Using fastFourier transform (FFT), Hilbert-Huang transform (HHT) signal processing method got the coaland rock specimens after multiple vibration excitation of the inherent frequency and its changerule, analyzed coal forced vibration resonance amplification effect and rupture of coal microseismand electromagnetic radiation signal characteristics. Combining the finite element analysissoftware ANSYS/LS-DYNA numerical analysis results, excitation frequency on the dynamicresponse of law is consistent with the analysis of laboratory experiments. According to thefracture dynamics theory, established a considering stress affected the intensity of the excitationfrequency of coal and rock burst criterion that resonance induced is proposed and the mechanismof coal and gas outburst prevention and control suggests.