摘要:
岩石受载破裂过程中释放的声发射信号携带大量声发射源的信息,岩石的宏观破裂表现在大破裂的产生,大破裂往往伴随着大能量的产生,对大能量信号的研究是探究岩石破裂信息的关键.通过岩石劈裂破坏实验,采用全相位FFT分析和小波包分解与重构的方法,重点分析不同通道声发射信号的相位谱特征,根据相位属性,划分为线性以及非线性相位.研究结果表明:线性相位广泛存在于劈裂演化阶段.根据应力与能量时间图将花岗岩破裂分为三个阶段:Ⅰ阶段劈裂成板,Ⅱ阶段剪切成块,Ⅲ阶段颗粒衍射.经小波分解去噪与重构后的声发射信号其相位的线性特征更加明显,绝对相位的提出能快速准确的识别相位的类别.不同通道的大能量声发射信号其绝对相位都是线性相位,这一结论为岩石破裂的阶段分析提供了重要思路.
Abstract:
Acoustic emission signal released during rock burst carry lots of acoustic emission sources information.Macroscopic fracture of rock is performed in the generation of large fracture, and large rupture is usually accompanied by the generation of large energy.So research on the large energy signal is the key to the research of rock fracture information.All phase FFT and wavelet packet decomposition and reconstruction are used in the research of rock splitting failure, and the phase spectrum characteristics of acoustic emission signals of different channels are analyzed, and the linear and nonlinear phase are divided according to the phase properties.The results show that the linear phase exists widely in the split evolution stage.According to the stress and energy time diagram, the rupture of granite is divided into three stages: splitting into plates in stage I, cutting into pieces in stage II and scattering of particles in stage Ⅲ.The linear feature of the phase of the acoustic emission signal after wavelet decomposition and reconstruction is more obvious, and the absolute phase can identify the type of phase quickly and accurately.The absolute phase of the large energy acoustic emission signals of different channels is the linear phase, which provides an important idea for the stage analysis of rock failure.
下载: