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为探讨不同水温下花岗岩劣化过程声发射特征,通过RLW-3000型测试系统和PCI-2型声发射系统,对自然干燥,50℃含水,100℃含水3类条件下花岗岩位移加载下声发射信号的小波分形盒维数进行试验研究。研究表明,加载过程峰值频率的变化规律能很好地反映水温对花岗岩声发射特征的影响,50℃与100℃水温条件下声发射信号的峰值频率高于自然干燥的峰值频率,前两者的峰值频率区别不大;主频范围的分形盒维数能定量反映不同水温下花岗岩声发射信号的差异,可为深入研究不同水温花岗岩声发射信号特征提供依据。
In order to investigate the acoustic emission characteristics of granite degradation process at different water temperatures, the acoustic emission signals under granite displacement under natural drying, 50 ℃ water content and 100 ℃ water content were measured by RLW-3000 test system and PCI-2 acoustic emission system The fractal dimension of wavelet fractal is studied experimentally. The results show that the variation law of peak frequency of loading process can well reflect the influence of water temperature on the acoustic emission characteristics of granite. The peak frequencies of acoustic emission signals at 50 ℃ and 100 ℃ water temperature are higher than the peak frequencies of natural drying. The fractal box dimension of the main frequency range can quantitatively reflect the differences of acoustic emission signals of granite under different water temperatures, which can provide basis for further study of acoustic emission characteristics of granite with different water temperature.