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采用数字化声发射系统,开展了单轴压缩条件下不同岩石损伤过程声发射实验,研究了岩石在单轴压缩过程中声发射活动与时间、载荷的相关关系,微观损伤及其扩展的机理。实验结果表明,在岩石微裂隙压密、微观损伤产生、扩展和破坏4个不同阶段,声发射事件表现出不同的分布特征,岩石声发射活动特性与所受载荷有较好的相关关系。通过对声发射事件率、事件时空分布特征、声发射波形特征等参数的变化规律研究,能有效预测岩石的破坏,为现场岩体破坏提供可靠的预测预报依据。
The acoustic emission experiment of different rock damage processes under uniaxial compression was carried out by using the digital acoustic emission system. The correlation between acoustic emission activity and time and load of rock under uniaxial compression was studied. The microscopic damage and its propagation mechanism were studied. Experimental results show that there are different distributions of acoustic emission events in four different stages of microcrack compression, microscopic damage generation, propagation and destruction, and the rock acoustic emission activity characteristics have a good correlation with the load. Through the study on the variation rules of acoustic emission events, temporal and spatial distribution of events, waveform characteristics of acoustic emission and other parameters, the damage of rock can be effectively predicted, providing a reliable basis for prediction and prediction of on-site rock mass destruction.