Fractal analysis of acoustic emission parameter series of coal with different properties under uniaxial loading

2nd International Conference on Materials Science, Energy Technology and Environmental Engineering

材料科学;能源学;生态环境科学

Yang, Huiming^1,2

State Key Laboratory of Gas Disaster Detecting, Preventing and Emergency Controlling, Chongqing

400037, China^1

Chongqing Research Institute of China Coal Research Institute, Chongqing

400037, China^2

关键词: Different coals;    Emission parameters;    Evolution characteristics;    Fractal analysis;    Fractal feature;    Fractal-dimension value;    Uni-axial loading;    Uniaxial compression experiment;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/81/1/012071/pdf
DOI  :  10.1088/1755-1315/81/1/012071

来源: IOP

【 摘 要 】

In order to study acoustic emission (AE) evolution characteristics of coal with different mechanical properties in failure process, uniaxial compression experiments of coals from 4 mines were carried out to analyse fractal feature of AE time series by G-P algorithm. The results indicate that AE parameter series of all 4 different coals have fractal feature, and the fractal dimension value of coal with different properties go through a process of "first rise, then fall". The change of AE fractal dimension value can reflect the cracking evolution in coal failure process, which is closely related with the failure phase. The continuous decline of AE fractal dimension can be viewed as a precursor of impending failure of coal, which could provide theoretical basis for the AE pre-warning model establishment of coal dynamic disaster.