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本文研究了压头侵入作用下大理岩的声发射。测试结果表明,在压入破岩过程的加载阶段,反映岩石内部微破裂的声发射活动性一般少而低,只有当压头周围产生微小片裂时,才偶发性地出现声发射的小波峰。侵入力一旦达到峰值,岩石内表面附近形成水平裂纹,岩石承受的载荷下降,声发射率(AER)随之发生急剧变化。水平裂纹的快速扩展,最终导致表面片裂。随后,声发射平息。侵入载荷重新增大,声发射活动性依然平静,于是开始下一循环的压入破岩过程。这种现象在各种压头侵入大理岩试验中均被观测到。
In this paper, the acoustic emission of marble under the intrusion of indenter is studied. The test results show that the acoustic emission activity reflecting the internal microcracking of the rock is generally low and low during the loading stage of the rock breaking process. The wavelet peak of the acoustic emission occurs accidentally only when the micro-fracturing around the indenter occurs. . Once the intrusion peaks, horizontal cracks form near the inner surface of the rock, and the load on the rock falls, and the AER changes drastically. The rapid expansion of horizontal cracks eventually leads to surface cracking. Subsequently, acoustic emissions subsided. As the intrusion load re-increases and the acoustic emission activity is still calm, the next cycle of intrusion is initiated. This phenomenon has been observed in various indentation intrusion marble tests.