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彤程度.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. By collecting uniaxial compression acoustic emission signals of marble and red sandstone, the correlation fractal dimension function was introduced to calculate the correlation dimension of acoustic emission time series under different stress levels. The relationship between fractal dimension and stress level was obtained. The results show that under the same stress level, the fractal characteristics of AE process are less obvious with the increase of m value. Under different stress levels, the correlation fractal dimension is different, and the AE process parameters have different self-similar and sub-level At the same time, it is found that the fractal characteristics of acoustic emission parameters have a certain scale range.