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进行煤样、岩样加载过程中的次声波变化特征研究,对进行煤矿井下地质灾害次声波监测具有重要意义.采用自主研发的煤岩蠕变-渗流试验系统和CASI-ISM-2013高精度电容式次声传感器进行煤岩样单轴加载过程次声波测试.通过FIR滤波器进行滤波、软阈值去噪,然后采用傅里叶变换对加载过程中次声波的频谱、时频特征进行对比、分析.分析结果显示:在煤、岩样发生峰值破坏之前都有次声波异常突变;与煤样相比,岩样产生的次声波事件具有更强的事件集中性和频率宽泛性.该研究成果证实了煤矿井下地质灾害次声波预测的可行性,并为该方法的进一步研究提供参考.
The study on the characteristics of infrasound changes during coal sample loading and rock sample loading is of great significance to the monitoring of subsonic sound waves in coal mine geological disasters.Using self-developed coal-rock creep-seepage test system and CASI-ISM-2013 high- Acoustic sensors were used to perform the sub-acoustic test of coal-rock uniaxial loading process, the FIR filter was used to filter and the soft threshold was used to denoise, then the Fourier transform was used to compare and analyze the spectrum and time-frequency features of the infrasound during the loading process. : In the coal, rock samples before the peak damage have sub-infrasonic mutations; compared with coal samples, rock samples generated by the acoustic events have more event concentration and frequency broadening.The results confirm the coal mine geological disasters, infrasound Forecast the feasibility of this method and provide reference for further research.