Influence of Intermediate Principal Stress on Acoustic Emission Evolutionary Characteristics of Granite Biaxial Compression Failure Process
In order to investigate the influence of intermediate principal stress on the acoustic emission evolution ary characteristics of granite biaxial compression failure process,a comprehensive analysis of the acoustic emission signals of granite biaxial compression failure process under different intermediate principal stresses was conducted from multiple perspectives in time and frequency domains.The test results show that the intermediate principal stress has a significant effect on the acoustic emission precursors of granite biaxial compression failure.With the increase of the intermediate principal stress,the stress level decreases when the cumulative acoustic emission ringing count reaches the continuous rapid growth stage,the continuous decline rate of the B-value decreases,and the stress level decreases when the proportion of the dominant frequency band(125～250 kHz)changes significantly.However,the proportion of low-frequency and high-amplitude signals increases.A variety of acoustic emission precursory characteristics of biaxial compression failure of granite were obtained.On the eve of rock instability and failure,the cumulative acoustic emission ringing count presents a continuous and sudden increase and a significant continuous decline in B-value,low-frequency and high-amplitude signals appear,and the proportion of dominant frequency band(125～250 kHz)shows an increasing trend.
rockbiaxial compressionintermediate principal stressacoustic emissionevolutionary characteristics
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