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通过变粒岩、花岗岩和石灰岩单轴压缩声发射试验,采集了岩石力学及声发射相关数据。运用Welch谱估计法对岩石破裂过程声发射信号的功率谱特征进行分析,并研究了峰值频率、能量占比的演化规律与岩石破坏的关联。结果表明,3类岩石受压破裂声发射信号的峰值频率均维持在(100±20)kHz,且在峰值频率正向较大波动点与能量占比高于25%信号点的波形特征多属突发型;能量占比的演化规律分两类,一类是先上升后下降,另一类是一直上升;在试件破坏期间,出现了峰值频率的较大波动与较高能量占比信号群增多的现象。应力、峰值频率以及能量占比值的联立分析,为更准确地预测岩体破坏失稳提供新思路和理论依据。
Through the uniaxial compression acoustic emission tests of granulite, limestone and granite, the data of rock mechanics and acoustic emission were collected. The Welch spectral estimation method was used to analyze the power spectral characteristics of acoustic emission signals in the process of rock failure. The correlation between the peak frequency and the energy evolution and the rock failure was also studied. The results show that the peak frequencies of acoustic emission signals of the three types of rock under pressure fractures are all maintained at (100 ± 20) kHz. Most of the waveform features of the signal point with the larger fluctuation point and the energy proportion higher than 25% Sudden type. The evolution of energy proportion is divided into two types, one is the first rise and then fall, and the other is always rising; during the destruction of the specimen, the larger peak frequency and the higher energy proportion signal The phenomenon of increased population. Stress, peak frequency and the proportion of energy accounted for the joint analysis for more accurate prediction of rock failure instability provide new ideas and theoretical basis.