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为研究花岗岩在不同加载方式下的声发射特性,对15块花岗岩试样进行了3种不同加载方式下的声发射测试试验。结果发现:单次加载方式下,加载应力达到破坏强度60%左右时,声发射发生突增;等幅循环加载方式下能否观察到Kaiser效应与其加载应力水平相关;分级循环加载方式下,Kaiser效应记忆先前加载应力的准确程度随着加载应力水平的增加而减弱,其存在应力水平大约为试样破坏强度的20%~60%。
In order to study the acoustic emission characteristics of granite under different loading modes, the acoustic emission tests of 15 granite samples under three different loading modes were carried out. The results show that when the loading stress reaches about 60% of the breaking strength, the acoustic emission suddenly increases. Under the same cyclic loading mode, whether the Kaiser effect is observed is related to the loading stress level. Under the cyclic loading mode, Kaiser The accuracy of previous loading stress of effector memory decreases with the increase of loading stress, and the existing stress level is about 20% ~ 60% of the breaking strength of specimen.