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为完善冲击地压灾害预测判据,通过试验研究煤、岩石和组合煤岩3类试样的声发射(AE)特性及冲击倾向性规律。结果表明:组合结构中的岩体对煤体的力学性质和冲击倾向性有显著影响。试样的载荷-冲击倾向-声信号变化具有一致性,随着冲击倾向从弱至强变化,AE信号分布呈密集连续-脉冲连续-瞬时脉冲的特征。分析大量不同冲击倾向性试样的AE量化数据发现,试样冲击倾向性越强,其峰后AE振铃计数和能量变化率越高,由此可将峰后AE振铃计数和能量变化率作为冲击倾向性判据。
In order to improve the predictive criteria of rock burst, the AE characteristics and impact propensity of three types of samples of coal, rock and coal are studied through experiments. The results show that the rock mass in the composite structure has a significant effect on the mechanical properties and impact propensity of the coal. The load-impact tendency of the specimen is consistent with that of the acoustic signal. As the impact tendency changes from weak to strong, the AE signal distribution is characterized by dense continuous-pulse continuous-transient pulse. Analysis of AE quantitative data of a large number of specimens with different impact tendencies shows that the stronger the impact tendency of the specimen is, the higher the peak ringing AE counting rate and energy changing rate are, thus the peak ring AE counting and energy change rate As the criterion of impact propensity.