岩石声发射特征的分形分析  

Fractal Analysis of the Characteristics of Acoustic Emission of Rock

作　　者：高峰[1] 李建军[1] 李肖音[1] 陈晶[1] 

机构地区：[1]中国矿业大学理学院,徐州221008

出　　处：《武汉理工大学学报》2005年第7期67-69,共3页Journal of Wuhan University of Technology

基　　金：国家重点基础研究发展规划"973"项目(2002CB412705);创新群体项目(50221402).

摘　　要：通过岩石单轴压缩声发射实验,利用GP算法计算了不同应力水平下的声发射时间序列的关联维数。研究发现关联维数值随相空间维数m的增大而增大,当m较大时趋于稳定。实验发现多数岩样在应力水平为极限应力的60%以前,分维值呈增大趋势。当达到破坏应力时,分形维数降低到一个最小值。这表明岩石声发射关联维数的变化反映了岩石内部损伤演化情况,分形维数的降低意味着主断裂或破坏的发生。Relevant fractal dimensions of rock acoustic emissions on different stress levels under uniaxial compression were obtained by analysing the experimental data. It increased with the dimension of phase space. The results showed that the dimensions of most of the rock samples grew slowly when applied stress was less than 6096 of the fracture stress, and reached minor values when the samples fractured. It predicted that the reduction of the fractal dimension indicated the occurring of the major cracks or failure.

关 键 词：岩石 声发射 分形 关联维数 破坏 

分 类 号：TU45[建筑科学—岩土工程]