关键词: 声发射, 声发射定位, 裂纹扩展, 岩石, 破裂过程

Abstract: To reveal the failure/instability mechanism of different rock samples, the acoustic emission (AE) and its location functioning was applied to studing on the rock failure process under uniaxial compression and what role the AE plays in it. The results showed that failure modes of all samples are the same, i.e., the split failure, and the AE functioning to those five kinds of rock samples differs from each other with load increasing under otherwise equal conditions, though their accumulative AE events are similarly few during initial loading step. During loading, the number of AE events is minimum in sandy rock but maximum in granite, and both the numbers in sandy rock and red granite change very clearly with no portent of failure to come. The AE location as a time-of-arrival results are affected by the elastic wave velocity in rock sample. It was found that AE location is unavailable to the samples of sandy rock, black marble and red granite but available to the samples of marble from Dandong and granite from Jinzhou indicating visually the formation and propagation of a crack and how it runs though. A conclusion is thus drawn that AE location functioning relates directly to the attributes of rock samples.