摘要
开展花岗岩单轴压缩声发射监测实验,利用横、纵波两种类型传感器接收花岗岩破裂过程声发射信号,从声发射事件率、能率、主频和主频幅值方面,研究花岗岩破裂过程声发射横、纵波时频特征的异同点,探索岩石破裂过程不同模式声发射波形信息的特征规律。研究结果表明:花岗岩破裂过程声发射纵波事件率在峰值载荷前出现明显声发射"平静期",而横波事件率"平静期"现象不明显;声发射横、纵波能率曲线形式一致,在临近峰值载荷时均出现陡升现象,但数值上纵波普遍高于横波。花岗岩破裂过程声发射纵波主频以低频(35~110 kHz)为主,数量占比达到96.4%,横波以高频(300~500kHz)为主,数量占比达到66.36%;对于纵波与横波,二者高幅值声发射信号均位于低频区间,意味着花岗岩破裂过程中高能量横、纵波声发射信号均表现出低频高幅值特征。研究结果扩展了对岩石破裂过程不同模式声发射特征的认识,进一步为建立基于声发射的岩石破裂预测方法提供科学依据。
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.
作者
张艳博
张行
梁鹏
陈绍杰
孙林
姚旭龙
刘祥鑫
梁精龙
ZHANG Yanbo;ZHANG Hang;LIANG Peng;CHEN Shaojie;SUN Lin;YAO Xulong;LIU Xiangxin;LIANG Jinglong(School of Mining Engineering,North China University of Science and Technology,Tangshan,Hebei 063210,China;College of Mining and Safety Engineering,Shandong University of Science and Technology,Qingdao,Shandong 266590,China;College of Metallurgy and Energy,North China University of Science and Technology,Tangshan,Hebei 063210,China)
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2019年第S02期3554-3564,共11页
Chinese Journal of Rock Mechanics and Engineering
基金
国家自然科学基金资助项目(51574102,51804122)
河北省自然科学基金项目(E2017209241)。
关键词
岩石力学
声发射
横、纵波
时频分析
rock mechanics
acoustic emission
S-wave and P-wave
time frequency analysis
