传感器类型对岩石破裂声发射时频特征影响实验研究
Experimental study on the influence of sensor type on time-frequency characteristics of rock rupture acoustic emission
Received:April 22, 2017  Revised:July 24, 2017
DOI:10.7520/1001-4888-17-099
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 (AE)  sensor type  time-frequency characteristics  energy spectrum coefficient
基金项目:国家自然科学基金项目(No.51574102);国家自然科学基金青年科学基金项目(No.51604117);河北省人才工程培养经费资助科研项目(A201500504)
Author NameAffiliation
ZHANG Yan-bo* 1.College of Mining Engineering, North China University of Science and Technology, Tangshan 063000, Hebei, China
2.Key Laboratory of Mining and Safety Technology of Hebei Province, Tangshan 063000, Hebei, China 
LI Kun 1.College of Mining Engineering, North China University of Science and Technology, Tangshan 063000, Hebei, China
2.Key Laboratory of Mining and Safety Technology of Hebei Province, Tangshan 063000, Hebei, China 
LIU Xiang-xin 1.College of Mining Engineering, North China University of Science and Technology, Tangshan 063000, Hebei, China
2.Key Laboratory of Mining and Safety Technology of Hebei Province, Tangshan 063000, Hebei, China 
TIAN Bao-zhu 1.College of Mining Engineering, North China University of Science and Technology, Tangshan 063000, Hebei, China
2.Key Laboratory of Mining and Safety Technology of Hebei Province, Tangshan 063000, Hebei, China 
YAO Xu-long 1.College of Mining Engineering, North China University of Science and Technology, Tangshan 063000, Hebei, China
2.Key Laboratory of Mining and Safety Technology of Hebei Province, Tangshan 063000, Hebei, China 
LIANG Peng 1.College of Mining Engineering, North China University of Science and Technology, Tangshan 063000, Hebei, China
2.Key Laboratory of Mining and Safety Technology of Hebei Province, Tangshan 063000, Hebei, China 
SUN Lin 1.College of Mining Engineering, North China University of Science and Technology, Tangshan 063000, Hebei, China
2.Key Laboratory of Mining and Safety Technology of Hebei Province, Tangshan 063000, Hebei, China 
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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:
      In this paper, in order to investigate the effect of the acoustic emission sensor on rock fracture monitoring, biaxial loading experiment of granite with holes was carried out. Selecting two types of sensor: R6α (narrow band) and Nano30 (broad band) to simultaneously monitor rock failure process, the similarities and differences of the time-frequency characteristics received by two types of sensor were analyzed. The applicability of two types of sensors from the working frequency band and sensitivity is discussed in this paper, and then the selection principle of AE sensors in rock fracture monitoring is put forward.Study results show that in time domain, the energy evolution pattern of acoustic emission signals received by two types of sensor is consistent. In frequency domain, the main frequency of R6α sensor received signals is concentrated in 33~110kHz, while the main frequency of Nano30 sensor received signals is uniformly distributed within 0 ~ 500kHz. The signal received by R6α narrow frequency sensor has high intensity and large data amount, which can insulate the interference of noise signal in other frequency bands. So it is suitable for analyzing the timing pattern of rock rupture. Nano30 broad band sensor can guarantee signal integrity in frequency, and can be used to analyze acoustic emission signal waveform and frequency characteristics of rock.
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