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.
出处
《武汉理工大学学报》
EI
CAS
CSCD
北大核心
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).
关键词
岩石
声发射
分形
关联维数
破坏
rock
acoustic emission
fractal
relevant dimension
fracture
