软煤与硬煤加载过程中声发射差异性及峭度特征

Kurtosis Characteristics and Acoustic Emission Difference of Soft Coal and Hard Coal Samples in Loading Process

探究软煤与硬煤声发射特征的差异性,对于准确进行地质灾害预测具有重要意义。在不同矿区有针对性的采集煤样以后,利用RMT-150B型岩石力学实验系统以及CDAE-1全数字化声发射监测与分析系统,对煤样加载过程中的应力-应变、声发射特征进行测试与分析,对其峭度特征进行了评价。测试结果显示:在声发射特征方面,软煤与硬煤相比,其连续性声发射产生时间较早,声发射值较小,并且声发射峰值的突变性不明显;在峭度特征方面,软煤的声发射峭度值整体较大。并且在峰值破坏前,声发射峭度值存在1个相对稳定期的特征可以作为煤样破坏的前兆,可以为地质灾害的监测、预测提供指导。

To explore the acoustic emission difference of soft coal and hard coal is important for the accurate prediction of geological hazards. The stress - strain and acoustic emission characteristics of coal samples collected from different mining areas in loading process were tested and analyzed by using RMT - 150B rock mechanics test system and CDAE - 1 all - digital acoustic emission detec- tion and analysis system, and its kurtosis features were evaluated. The resuh shows that the continuous acoustic emission generated in soft coal is earlier than that in hard coal, with a smaller acoustic emission value and an unconspicuous mutational acoustic emission peak. Besides, the kurtosis value of soft coal is larger than that of hard coal on the whole. And the characteristic that acoustic emission kurtosis has a relatively stable period before peak failure not only can be used as a precursory of coal destruction, but also can provide guidance for the monitoring and prediction of geological hazard.