Study on damage evolution characteristics of coal and rock uniaxial compression based on the acoustic emission

摘要

In order to obtain damage evolution characteristics of coal and rock under the compression, conduct uniaxial compression experiment for coal and rock with rigid loading experiment machine based on the acoustic emission. Gather the AE characteristic parameters in the process of coal and rock damage, use the damage variable of the accumulated AE ringing count, build uniaxial damage model for coal and rock based on the gathered acoustic emission characteristics, the damage evolution equation of coal and rock under compression is given, discuss the relationship between Acoustic emission parameters and mechanics failure mechanism of coal and rock. Research results show that acoustic emission signal can reflect the internal damage of coal and rock, which is closely related to their internal native crack compaction and evolution process including new crack production, extension and cut-through. The deformation and damage evolution degree of loaded coal and rock present positive correlation characteristics with accumulated acoustic emission ringing count.