大理岩单轴岩爆试验声发射信号特征研究

An experimental study on marble rockburst based on multiparameter normalization

利用MTS 815电液伺服测试系统和PCI-Ⅱ型声发射监测系统,对丰山铜矿深部大理岩试样进行单轴加载,从而获得大理岩试样在单轴加载条件下的声发射振铃计数、幅值、能量等声发射特征参数。结果表明,大理岩的AE振铃计数和幅值的活动规律基本吻合,但声发射振铃计数在岩爆前具有更加明显的平静期;对振铃计数、幅值和能量累计曲线归一化处理后发现:能量累计曲线和振铃计数累计曲线互相伴随,同步增加。经过对比分析,发现幅值累计曲线可以更快的响应裂纹的变化,曲线的初始增长点和曲线增长的“临界点”可作为岩石破坏的前兆特征点。

Using MTS electro-hydraulic servo test system and PCI-815 type Ⅱ acoustic emission monitoring system,the deep green mountain marble specimen under uniaxial loading,thereby gaining marble specimen under uniaxial loading condition of the acoustic emission ringing counts,amplitude,energy,such as acoustic emission characteristic parameters.The results showed that the AE ringing count of marble was basically consistent with the activity rule of amplitude,but the AE ringing count had a more obvious quiet period before rock burst.After normalization of the bell counting,amplitude and energy accumulation curve,it is found that the energy accumulation curve and the energy accumulation curve of the bell counting increase synchronously with each other.Through comparative analysis,it is found that the cumulative amplitude curve can respond to the change of crack faster,and the initial growth point of the curve and the"critical point"of the curve growth can be used as the precursor feature points of rock failure.