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本文叙述大理岩岩样在双轴、三轴压缩至断裂时的声发射变化特征。在一定的加载速率时,若岩样屈服并在出现前兆应力降后产生突发断裂,声发射率随应变的衰减系数h_ε,在主断裂前呈现平稳—下降—回升趋势变化,而声发射事件总数随应变的增长系数h_1、h_2都呈现平稳—上升—回降趋势变化。声发射率,n也呈现平稳—上升—回降趋势变化。而当岩样屈服,并在出现前兆应力降后产生蠕滑断裂,h_εh_2依然与前述变化相同。而h_1,和声发射率n则为平稳—上升而后保持在高(水平)值上并不回降,并且初步论述了O_3,方向压机刚度在大于某一定值时,发生蠕滑断裂,在小于某一定值时,才发生突发断裂。这就为利用地震频度的变化预报地震提供了一种可能的物理依据。
This paper describes the acoustic emission characteristics of marble samples from biaxial to triaxial compression to fracture. At a certain loading rate, if the rock samples yield and produce sudden rupture after the pre-stress drop, the acoustic emissivity decreases with the attenuation coefficient h_ε of the strain, showing a steady-drop-rise trend before the main rupture. However, The total number of growth factors h_1, h_2 all showed a steady-rising-falling trend. Acoustic emissivity, n also showed a steady - rising - falling trend changes. When the rock samples yield and produce creep rupture after the pre-stress stress drop, h_εh_2 remains the same as above. While h_1, and the acoustic emission rate n is steady - rise and then remain at a high (horizontal) value does not fall back, and initially discussed O_3, the direction of the press stiffness greater than a certain value, the occurrence of creep rupture, Less than a certain value, burst fracture occurred. This provides a possible physical basis for predicting earthquakes by the change of seismic frequency.