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为了解岩石损伤变形破坏过程中产生的声发射信号的级频维数特征,利用先进的MTS815岩石力学性能试验系统和PAC的DISP-II声发射仪,对大理岩试样进行了常温下力学性能的实验研究和理论分析,系统地分析了岩石变形破坏过程中的声发射特征及其力学机制.研究结果表明:在同一应力水平下,随着嵌入空间维数m值增大,声发射过程的关联维数也相应增加,而自相似程度随着m值的增大而减弱;级频分形维数随着岩样所受应力的增加呈降低的趋势,试件破坏时级频分形维数达到某一最小值,这体现了岩样破坏前损伤局部化特征.
In order to understand the characteristics of the frequency-dependent dimension of acoustic emission signals generated during the deformation and failure of rock damage, the MTS815 rock mechanical properties test system and PAC DISP-II acoustic emission apparatus were used to study the mechanical properties of marble samples at room temperature , The acoustic emission characteristics and mechanical mechanism in rock deformation and failure process are analyzed systematically.The results show that under the same stress level, as the dimension of embedded space m increases, the acoustic emission process The correlation dimension also increased correspondingly, while the degree of self-similarity decreased with the increase of m value. The fractal dimension of the fractal frequency tended to decrease with the increase of the stress of the rock specimen, A certain minimum value, which shows the local damage characteristics before rock failure.