To investigate relation between fracture scale and acoustic emission time-frequency parameters in rocks, experiments of acoustic\nemission monitoring of granite uniaxial compression were carried out. The AE signal energy and dominant-frequency of granite\nfracture processwere extracted bymeans of AE time-frequency analysis.Therelation between fracture scale andAE time-frequency\nparameters (energy and frequency) in granite fracture process was analyzed. The evaluation model of rock fracture scale based on\nAE energy and dominant-frequency was established by using the intrinsic relation between the scale of rock fracture and the timefrequency\nparameters of rock mass. The evolution of crack scale in the process of uniaxial compression was analyzed based on the\nevaluation model of rock fracture scale. Results show that the AE energy and the dominant-frequency can reflect the crack scale\ninside the rock. The scale of rock fracture is proportional to the AE energy, which is inversely proportional to the AE dominantfrequency.\nSignals with low frequency and high energy usually represent large-scale cracks. On the contrary, if the high frequency\nhas low energy value, it indicates a small-scale crack. The theory andmethod of evaluation of rock rupture scale based on AE timefrequency\ninformation (energy, frequency) can describe the failure process of rock crack scale variation characteristics. It provides\na way and method for investigating the characterization of fracture size evolution process of rock fracture.
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