关键词: 坚固体模式, 声发射, 尾波

Abstract: In this work, using the method determining the earthquake magnitude from coda wave continuous time, the intensity characteristics of acoustic emission in rupture preparation process of the sample including hard inclusion is studied. The results show that the intensity of AE is steady at the early pressuring stage. When the pressure reaches to 89% the rupture pressure stress, the intensity obviously increases; when the pressure comes up to 92% the rupture pressure stress and the intensity reaches the maximum value greater 20% than the value at the initial pressuring stage. Then the intensity falls, drops to the minimum value and relative quiet activity of AE appears at this time with the pressure increasing. With the pressure further increasing, the intensity rises again, following closely the main rupture occurs. As viewed from the space distribution of AE, AE occurs in the periphery of hard inclusion in the process from the steady value at early loading stage to the maximum and roughly appears in the hard inclusion and above it from the low value to recovering of the high value. At last the main rupture occurs and the inclusion rupture locally too, which is similar to the time progress in phenomenon before the Lancang-Genma earthquake.

Key words: Hard inclusion, Intensity of AE, Coda wave