Sound signal analysis for warning and intensity evaluation of rockburst

The rockburst process was reproduced using a true-triaixal rockburst test system in laboratory. The sound signal in the rockburst process was recorded and preprocessed, and the feature indexes of the sound signals in three typical failures in the rockburst process, including rock particles ejection, rock splitting, and rock plate ejection, were investigated. The results show that the feature indexes in the three typical failures such as the waveform, the spectrum, the sound print and the short-term energy exhibit significant differences from each other. Finally, an indicator called total energy of local sound (TELS) was proposed as applicable to assessing the rockburst intensity.