【摘要】 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%。更多还原

【Abstract】 To study the acoustic emission characteristics of granite under different loading methods,15 samples of granite were tested for the characteristics of acoustic emission along three different loading modes. The results showed that under single loading mode,loading stress reaches about 60% of the breaking strength,the acoustic emission sudden increase. Under equal amplitude cyclic loading mode,whether Kaiser effect can be observed depend on the stress level. Under step cyclic loading mode,the accuracy of Kaiser effect decreased when stress level increases. And Kaiser effect exists in the stress level,which is about 20% ~ 60% of the breaking strength of the sample.更多还原