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邓绪彪, 王新月, 孙本利, 敬晨辉. 基于声发射波形能量谱的岩石裂隙演化研究[J]. 矿业安全与环保.
引用本文: 邓绪彪, 王新月, 孙本利, 敬晨辉. 基于声发射波形能量谱的岩石裂隙演化研究[J]. 矿业安全与环保.
DENG Xubiao, WANG Xinyue, SUN Benli, JING Chenhui. Investigation on evolution of rock fractures based on acoustic emission by waveforms' energy spectrum[J]. Mining Safety & Environmental Protection.
Citation: DENG Xubiao, WANG Xinyue, SUN Benli, JING Chenhui. Investigation on evolution of rock fractures based on acoustic emission by waveforms' energy spectrum[J]. Mining Safety & Environmental Protection.

基于声发射波形能量谱的岩石裂隙演化研究

Investigation on evolution of rock fractures based on acoustic emission by waveforms' energy spectrum

  • 摘要: 采用声发射波形的空间能量分布确定岩石裂隙扩展方向,研究了单轴压缩下白砂岩的裂隙演化特征;通过白砂岩预制裂纹样的三维声发射监测试验,采用短时傅里叶变换( STFT)获取各通道波形的能量谱,以能量最小通道到能量最大通道的方向表示微裂隙方向,以能量大小表征裂隙长度,得到微裂隙声发射矢量。研究表明:白砂岩的裂隙扩展以平行于主应力方向和理论共轭剪切面方向为主,在初始压密段和弹性段,以某一方向裂隙为主导;从裂隙变形段开始,三个方向上的裂隙占比开始逐渐趋同,在峰前软化段趋于30%。研究还发现,声发射矢量沿主破裂面集聚分布,并且在峰前软化段形成贯穿岩样的剪切带,是较为可靠的岩石破坏临界前兆。

     

    Abstract: In order to study the fracture evolution characteristics of white sandstone under uniaxial compression loading, the spatial energy distribution of acoustic emission (AE) waveform is applied to determine the fracture direction of rock. Through the three-dimensional AE monitoring test of white sandstone with prefabricated crack, the energy spectrum of waveform from each channel was obtained by short-time Fourier transform (STFT). The microfracture direction was represented by direction of the channel with the minimum energy to that with the maximum. The fracture length was calculated by magnitude of the channel with maximum energy. Thus the AE vector of microfracture was obtained. The results show that fracture propagation directions of white sandstone are mainly parallel to the principal stress direction and the theoretical conjugate shear plane directions. In stages of the initial compaction and the elastic, fissures were mainly in one of the three directions. Starting from the crack deformation section, proportions of fractures in the three directions began to decrease gradually, and tended to be 30% in the pre-peak softening section. It is also found that the AE vector is clustered along the main rupture surface, and a shear zone running through the rock sample is formed in the pre-peak softening section, which may be a reliable critical precursor to rock failure.

     

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