Test Study on Acoustic Emission Evolution Characteristics in Failure Process of Plastic and Brittle Coal
YANG Huiming
Abstract：Under the condition of uniaxial compression, monitoring test of acoustic emission was carried out in the failure process of both plastic and brittle coal specimen and study was made on the evolution characteristics of acoustic emission in their failure process. The test results showed that the acoustic emission in the failure and destabilizing process of coal corresponded with the process of crack initiation,extension and interconnection in the coal,and the evolution characteristics of acoustic emission of coal were closely related to its failure characteristics. The acoustic emission event rate in the failure process of the plastic coal presented an evolution regularity of “up-peak-down”;the steady decrease of the acoustic emission event rate after its rapid increase was the precursor of the main fracture surface connection and the failure and destabilization of coal. The acoustic emission event rate of the brittle coal presented an evolution regularity of “up-peak” and the “down” stage of acoustic emission was not obvious. The study results can provide a theoretical basis for the explanations of the acoustic emission parameter evolution in coal stability monitoring and the establishment of identification criteria for catastrophe.
Keywords：plastic coalbrittle coalfailureacoustic emissionevolution characteristics
Publication Date：2015-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：4( 9-12 )