Fractal and Chaos Characteristics of Acoustic Emission During Failure of Cemented Filling Body

The cemented filling body is taken as the object of this study, whose nonlinear dynamic characteristics of damage and instability are researched by virtue of acoustic emission (AE) under uniaxial cyclic loading and unloading test. The results show that there exists similarity in variation trend between correlation dimension and maximum Lyapunov exponent during each loading stage, which also verifies the disorder and chaos often reflect the complexity of fractal. Before the filling body gets to the instability, the correlation dimension declines continuously. So the filling body’s unstable failure is a kind of ordered dimension reduction process. Such kind of characteristic can be as a criterion condition for filling body’s failure. The maximum Lyapunov exponent varies little in magnitude, therefore, it can’t be apt to be used as the criterion condition, but it can be used to predict the AE time series that is of chaos feature, and through it higher forecast precision can be got.