(1. School of Mining Engineering，North China University of Science and Technology，Tangshan，Hebei 063210，China；
2. College of Mining and Safety Engineering，Shandong University of Science and Technology，Qingdao，Shandong 266590，China；3. College of Metallurgy and Energy，North China University of Science and Technology，Tangshan，Hebei 063210，China)
Abstract：In the present study，acoustic emission(AE) technique is employed to capture the acoustic signals from granite uniaxial compression test，which include both S-wave and P-wave. From the aspect of event rate，energy rate，main frequency and the amplitude of main frequency，the similarities and differences of the characteristics of P-wave and S-wave in time domain and frequency domain in were studied. Apart from the traditional AE parameter analysis，the acoustic emission waveform information of different modes in rock fracture process were analysed. The results show that there is apparent “quiet period” of event rate in P-wave before the peak load，while the “quiet period” phenomenon in S-wave is not obvious. The energy rate of P-wave and S -wave both rise sharply When approaching peak load. However，the P-wave is generally higher than the S-wave. The main frequency of P-wave is mainly low frequency(35–110 kHz)，accounting for 96.4%. While that of S-wave is mainly high frequency(300–500 kHz)，accounting for 66.36%. Acoustic emission with high amplitude are concentrated in low frequency range for both P-wave and S-wave. It means that the acoustic emission with high energy all show low frequency and high amplitude characteristics. The research results extend the understanding of the acoustic emission characteristics of different modes，and provide scientific basis for rock fracture prediction methods based on acoustic emission technology.
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2019, Vol. 38 
