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科技导报  2015 

FFT频谱分析在微震信号识别中的应用

DOI: 10.3981/j.issn.1000-7857.2015.02.013, PP. 86-90

Keywords: 微震监测信号,FFT,频谱分析

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Abstract:

为识别采场大爆破信号与岩石破裂大震级微震信号,运用MATLAB的快速傅里叶变换(FFT)频谱分析,对采场大爆破信号和大震级微震信号的功率谱和幅频特性进行分析,并对比两者能量在频带上的分布差异。研究表明,大震级微震信号频带分布较宽,且在30~50Hz达到了最大幅值,采场大爆破信号频带更窄、幅值更大、且一般在10Hz就能达到最大幅值。由于爆破释放的能量较大且释放的非常快,采场大爆破信号能量大多分布在0~30Hz的低频区域,大震级微震信号的能量大多分布于30~50Hz区域。利用信号特性实现对两种信号快速有效的辨识,为后期微震监测对地压风险区域的预测预报提供了准确的数据支撑。

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