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为了研究时间对岩石应力记忆的影响,利用岩石试验机和SDAES数字声发射检测仪对2次加载时间间隔分别为2,7,15,30和45 d的片岩进行单轴压缩条件下的声发射Kaiser效应试验。试验结果表明:首次加载7 d后再次加载Kaiser效应明显,30 d后还可以观察到Kaiser效应,而45 d后Kaiser效应已难以辨认;随着首次加载与第二次加载间隔时间的增长,岩石Kaiser效应逐渐衰退;首次加载的应力水平影响岩石Kaiser效应的消退,介于岩石强度的30%~80%之间,岩石记忆先前应力的能力最好。
In order to study the effect of time on the stress-memory of rock, acoustic emission under uniaxial compression was carried out using rock test machines and SDAES digital acoustic emission detector at 2, 7, 15, 30, and 45 d intervals Kaiser effect test. The experimental results show that the Kaiser effect is obvious after 7 days of first loading, and the Kaiser effect can be observed after 30 days. However, the Kaiser effect is illegible after 45 days. With the increase of the first loading and the second loading, the rock Kaiser effect gradually declines; the stress level of the first load affects the subsidence of the Kaiser effect of the rock, ranging from 30% to 80% of the rock strength, and the ability of the rock to remember the previous stress is the best.