Research on the Failure Evolution Process of Rock Mass Base on the Acoustic Emission Parameters

Fracture mechanics behavior and acoustic emission (AE) characteristics of fractured rock mass are related to underground engineering safety construction, disaster prediction, early warning. In this study, the failure evolution intact fracture (e.g., single fracture, parallel fractures, cross mixed fractures) coal were studied contrasted with each other on basis distribution max amplitude AE. The study revealed some meaningful results, where value b (i.e., characteristic AE) could represent process coal. maximum AE events was characterized by Gaussian normal distribution, probability corresponding 35∼50 dB largest. stress range 60∼80%, increased rapidly, b decreased. energy showed a downward trend after reaching at about 80% level. Under same level, more complex was, larger coal–rock stronger inhibition effect expansion caused internal was. Due anisotropy crack, discrete, while crack decreased, dispersion deformation cracked mainly adjustment cracks during initial loading experienced decreasing first, then increasing, in process. When load reached 0.8 times peak strength, had secondary trend, indicating macroscopic sample, which be used as precursor criterion for complete mass.