【摘要】 本文研究了物理性不同的三种岩石在不同应变速率影响下声发射 b 值随应力增加而变化的特征。结果表明:应变速率在(10^-4～10^-8)范围内三种岩石的声发射 b 值都随应力增加而减小。它们的高 b 值区随应变速率下降向应力增加方向偏移。同时,三种岩石的 b 值随应力的变化对不同应变速率的反应程度是不一样的,说明无论是应力状态或是岩石的物理性质都能影响岩石 b 值的变化,但,也都不是决定岩石声发射 b 值的唯一因素。更多还原

【Abstract】 Using samples of 3 kinds of rocks having dissimilar physical properties, this paper studies the variations of b-values of their acoustic emssions (AE) dependent on the study shows the AE b-values of the 3 kinds of rocks all tend to decreasd along with the stress increases when the strain rale changes within the range of 10-4-10-8. The high b-valuc portion deviates in the direction of stress increases in the course of strain rate decreases. The 3 kinds of rocks show dissimilar responsiveness of the b-values under different strain rates in the course of stress variations. These suggest that b-values of the rocks are not only influenced by the stress conditions, but also by their own physical properties. Nevertheless, those two features are not the sole factors determining the AE b-values of the rocks.更多还原