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传感器类型对岩石破裂声发射时频特征影响实验研究
Study on the Influence of Sensor Types on Time Frequency Characteristics of Acoustic Emission from Rock Failure
投稿时间: 2017-04-22  最后修改时间: 2017-07-24
DOI:
中文关键词:  岩石力学  声发射  传感器类型  时频特征  能谱系数  
英文关键词:rock mechanics  acoustic emission  sensor type  time-frequency characteristics  energy spectrum coefficient  
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目)
作者单位E-mail
张艳博 华北理工大学 fzdn44444@163.com 
李昆 华北理工大学 hblg_lk2016@163.com 
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中文摘要:
      为探究声发射传感器对岩石破裂监测效果的影响,本文开展了含孔花岗岩双轴加载实验,选择R6α(窄频)和Nano30(宽频)两类传感器同时监测岩石破裂过程,分析两种类型传感器接收信号时频特征的异同点。从工作频段及灵敏度讨论两类传感器的适用性,继而提出岩石破裂监测中声发射传感器的选取原则。研究结果表明,在时域方面,两类传感器接收的声发射信号能量演化规律体现出一致性。在频域方面,R6α传感器接收信号主频集中分布在33-110kHz,Nano30接收信号主频在0~500kHz内均匀分布。R6α窄频传感器接收信号的强度较高、数据量较大,能够隔绝其他频段内噪声信号干扰,适合分析岩石破裂的时序规律;Nano30宽频传感器从频率上能保证信号的完整性,可用于分析岩石声发射信号波形和频率特征。
英文摘要:
      To explore the impact of the acoustic emission sensor monitoring effect on rock burst, the biaxial test with hole granite was carried out. Select R6 alpha (narrow band) and Nano30 (broadband) two types of sensors monitoring the rock failure process and analyze the signals of two different types of acoustic emission sensors in time-frequency feature similarities and differences. Discussed the applicability of the two types of sensors from the working frequency band and sensitivity, and then proposed the selection principle of AE sensors in rock failure monitoring. The results show that, in the time domain, the energy evolution law of the acoustic emission signals received by the two sensors is consistent. In the frequency domain, the dominant frequency signal of R6 sensor is distributed in 33-110kHz, and the dominant frequency signal of Nano30 is uniformly distributed in 0~500kHz. The signals of R6 alpha narrow sensor have high strength, large amount of data. This sensor can be isolated from other band noise interference and suitable for the analysis of timing rule of rock fracture. Nano30 broadband sensors can guarantee the integrity of the signal from frequency, and can be used to analyze the waveform and frequency characteristics of acoustic emission signals.
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