A study on the acoustic emission characteristics of the coal rock on different bedding direction
Xiaohui Liu1, 2, Xiaoping Zhao3, Jianfeng Liu2
COMPUTER MODELLING & NEW TECHNOLOGIES 2014 18(5) 308-313
1College of Energy and Environment, Xihua University, Chengdu, Sichuan, China, 610039
2College of Water Resources and Hydropower, Sichuan University, Chengdu, Sichuan, China, 610065
3Chengdu Engineering Corporation, Power China, Chengdu, Sichuan, China, 610072
The rock mechanics servo system (MTS815) and the acoustic emission testing system (PCI-2) were selected in this paper to conduct the uniaxial compression test and the acoustic emission test from two different direction of the coal and to clarify the acoustic emission feature during the process compression deformation of the coal. The results show that there is an obvious difference on the characteristic parameter of acoustic emission and the spatial distribution during the process of uniaxial compression, which is from different directions. On the initial compression phase, the stress growth rate of the coal from the vertical direction is greater than that from parallel bedding coal and the acoustic parameters. Acoustic emission ringing, energy and event count rate are less than the coal rocks from parallel bedding. The acoustic emission count will increase with arise stress, the coal from the parallel direction is more stable than the coal from the vertical direction; the coal acoustic emission has significantly reduced which from the vertical direction when after the peak stress and there is a little change with the parallel coal rock; The acoustic emission event of the coal which is from the vertical direction and the parallel coal usually concentrates in the lower part of the coal.