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采用室内试验方法,对8组砂岩试件进行了压缩破坏试验,同步记录岩石变形破坏过程中的次声信号,采用小波分析方法对异常信号的能量特征进行了分析研究。结果表明:岩石变形破坏次声异常信号能量主要集中在3.91~7.81 Hz的中频段和7.81~15.62 Hz的高频段两个频率范围内,其中中频段能量大于高频段能量,同时在低频段0~3.19Hz内也存在一定的能量分布,通过不同频段能量分布对比,可对信号进行识别;随着岩石变形破坏程度的增加,次声异常信号的中低频段能量在相对减少,而高频段能量相对增加,在岩石临近破坏前,次声信号的中低频段能量与高频段能量的比值接近1。以上几个方面特征的发现,为岩石变形破坏的次声异常信号识别及破坏前兆预警提供了重要的依据。
Compression failure tests were carried out on eight sandstone samples by indoor test method. The infrasonic signals were recorded synchronously and the energy characteristics of the anomaly signals were analyzed by wavelet analysis. The results show that the energy of the infrasound signal of rock deformation and damage is mainly concentrated in the middle frequency range of 3.91 ~ 7.81 Hz and the high frequency range of 7.81 ~ 15.62 Hz, of which the energy in the middle frequency range is higher than that in the high frequency range, 3.19Hz there is also a certain energy distribution, through the energy distribution of different bands compared to identify the signal; with the deformation of the rock deformation increased, the low-mid-band energy of infrasound signal energy is relatively reduced, while the high-band energy relative Increase, in the rock near the destruction, the infrasound signal in the low-band energy and high-band energy ratio close to 1. The above characteristics of the discovery of several aspects, provide an important basis for the identification of the infrasound signal of rock deformation and damage and the early warning of damage precursors.