单轴下岩石声发射参数的分形特征

通过采集大理岩和红砂岩单轴压缩声发射信 号，引入关联分维函数，计算了不同应力水平下的声发射过程时间序列的关联维数，得 到了关联分维数与应力水平的变化关系. 结果表明，在同一应力水平下，随着$m$值的 增大, AE过程的分形特征越不明显；在不同应力水平下，关联分维数不同， AE过程参数具有不同的自相似和分形程度. 同时发现，声发射过程参数的分形特 征具有一定的尺度范围.

FRACTAL ANALYSIS OF THE PROCESS PARAMETER OF ROCK'S ACOUSTIC EMISSION UNDER UNIAXIAL COMPRESSION

The signal parameter of rock's acoustic emission is of fractal nature. The signal parameters of acoustic emission are obtained in uniaxial compression experiment about griotte and red sandstone at different stress levels. By introducing relevant dimensions functions, the dimension number of signal parameters of rock's acoustic emission in time domain at different stress levels is computed and the relevant dimensions are obtained as a function of stress levels. The results show that the process of AE has less obvious fractal feature with $m$ increasing under same stress level. Under different stress levels, the dimension number is different, the precess of AE have different degree of self-similar and fractal nature. Fractal characteristics of the process parameter of rock's acoustic emission has a certain dimension scope.