单轴下岩石声发射参数的分形特征  

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

作　　者：梁忠雨[1] 高峰[2] 蔺金太 冯叔忠[1] 郑治国[1] 

机构地区：[1]军事交通学院基础部,天津300161 [2]中国矿业大学理学院,徐州221008 [3]不详

出　　处：《力学与实践》2009年第1期43-46,共4页Mechanics in Engineering

基　　金：“973”国家重点基础研究发展计划资助项目(2002CB412705)

摘　　要：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.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.

关 键 词：岩石力学 声发射 分形 关联维数 

分 类 号：TU459[建筑科学—岩土工程]