Research on characteristics of infrasound signals of waste dump sliding

Laboratory tests of slip instability of dump were carried out to explore the characteristics of infrasound signals excited by slip instability of waste dump. The collected infrasonic signals were processed by EEMD method, and then their time-varying characteristics of amplitude, energy and b value were analyzed. The results showed: ①the EEMD could filter out the high frequency part of the signal and its trend item, and effectively extracted the characteristic signals produced by slip instability of the dump; ②Through the comparison of the time-domain waveform diagrams of each IMF component, it was found that frequency range of the characteristic signals produced by the slip instability of the dump was 0~3 Hz; ③The signal amplitude was the largest when integral slip occurred. At that time, signal energy increased by leaps. The b value decreased continuously and reached the minimum value when the overall sliding happened. The above characteristics of infrasonic signal could be used for monitoring and advance warning of slip instability of waste dump.