In-situ Geostress Test by Rock Acoustic Emission Based on Wavelet Packet Analysis
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摘要: 根据目前岩石声发射确定Kaiser点存在的问题采用小波包分析研究方法,在单轴加载岩石声发射试验的基础上,首先提出了基于小波包变换的Kaiser点信号的信噪分离方法,其次确定了Kaiser点信号的频率范围,最后利用小波包分析对岩石声发射信号的能量分布特征进行研究,得到了砂岩Kaiser点信号的特征频带。结果表明,小波包分析是处理岩石声发射Kaiser点信号的一种有效的方法,进而为AE法测量地应力确定Kaiser点奠定了一定的试验基础。Abstract: Aimed at the difficulties to determine Kaiser point of rock acoustic emission, wavelet packet analysis is put torward. Based on acoustic emission tests of sandstone specimens under uniaxial compression. First AE (acoustic emission) signal noise reduction method for Kaiser point using wavelet packet is presented. Then get the frequency of AE signal. Last, using the wavelet packet analysis study the energy distributions of AE signals and the characteristic frequency band of Kaiser point are obtained. Results show that wavelet packet analysis is an effective way in processing of rock AE.
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Key words:
- acoustic emission /
- Kaiser effect /
- wavelet packet analysis /
- wavelet analysis /
- energy distribution
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