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本文同时用时域和频域分析方法对单轴压缩下大理岩试样的声发射特性进行了深入的研究,试图揭示在应力作用下大理岩试样声发射特性发生变化的实质,从而为声发射技术的现场应用找到合适的预报方法、预报参数和预报点。研究结果表明:当岩石接近破坏时(1)声发射信号主频向低频方向移动;(2)高频窗口的能率和声发射率较低频窗口的能率和声发射率有较大的下降,且能率的变化较声发射率的变化显著。由此,本文作者认为:能率在岩体破坏预报中是一个较好的参数;在现场监测中建立多个监测频率窗口,根据能率和声发射率在各频率窗口的不同变化可以较为可靠地预报破坏的来临。
In this paper, the acoustic emission characteristics of marble specimens under uniaxial compression are studied in detail in time-domain and frequency-domain analysis methods, in order to reveal the essence of changes in the acoustic emission characteristics of marble specimens under stress, and thus to achieve acoustic emissions. On-site application of technology to find suitable forecasting methods, forecasting parameters and forecast points. The results show that: when the rock is close to failure, (1) the main frequency of the acoustic emission signal moves towards the low frequency direction; (2) the energy rate and acoustic emission rate of the high frequency window have a greater decrease in the energy rate and acoustic emission rate of the lower frequency window. And the change of energy rate is more significant than the change of acoustic emission rate. Therefore, the author of this paper believes that energy rate is a good parameter in rock mass destruction forecasting; multiple monitoring frequency windows are set up in on-site monitoring, and predictions based on energy and acoustic emission rates at different frequency windows can be reliably predicted. The advent of destruction.