【摘要】 岩石受压会产生局部能量快速释放现象并引起声发射。由于声发射信号是岩石体积效应的综合体现,因此其蕴含着复杂且能体现岩石内部形态结构变化的信息。采用多重分形对声发射信号特征进行解构分析,发现不同加载阶段声发射信号多重分形谱形态均呈现小概率事件的特征,这说明岩石破坏过程的复杂性;进一步研究表明,岩石濒临破坏时声发射信号特征参数与加载初期存有显著差异:加载初期,信号多重分形谱谱宽较大,而濒于破坏时声发射信号标度区间显著增加,不同加载阶段声发射信号结构已经发生变化;不同种类岩石试验的声发射信号都给出类似的提示。更多还原

【Abstract】 The rock under pressure can release energy quickly.Some of this energy is released in the form of wave such as acoustic emission.In fact,the acoustic emission signal is a comprehensive embodiment information of the rock volume effect;therefore it contains complex and rich messages which can reflect the rock internal morphology changes.The characteristics of acoustic emission signal are analyzed by the multi fractal theory in this research.The preliminary study indicated that the multi-fractal spectrum of the acoustic emission signal had a feature of small probablity event.The results of further analysis show that the characteristic parameters of acoustic emission signal are quite different at the brink of destruction from those at early loading.This study found that for this complex process of the rock damage,at early loading,the width of multi-fractal spectrum of the signal was large,and the scale interval of acoustic emission signal significautly increased at brink of destruction.This conclusion verified by analyzing the feature of the acoustic emission signal of different kinds of rock..更多还原