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Geomechanics and Engineering
  Volume 12, Number 4, April 2017, pages 627-637

Study on correlation of acoustic emission and plastic strain based on coal-rock damage theory
Peijian Jin, Enyuan Wang and Dazhao Song

    The high positive correlation between plastic strain of loaded coal-rock and AE (acoustic emission) characteristic parameter was studied and proved through AE experiment during coal-rock uniaxial compression process. The results show that plastic strain in the whole process of uniaxial compression can be gained through the experiment. Moreover, coal-rock loaded process can be divided into four phases through analyzing the change of the plastic strain curve : pressure consolidation phase, apparent linear elastic phase, accelerated deformation phase, rupture and development phase, which corresponds to conventional elastic-plastic change law of loaded coal-rock. The theoretical curve of damage constitutive model is in high agreement with the experimental curve. So the damage evolution law of coal rock damage can be indicated by both acoustic emission and plastic strain. The results have great academic and realistic significance for further study of both AE signal characteristics during loaded coal-rock damaged process and the forecasting of coal-rock dynamic disasters.
Key Words
    loaded coal-rock; plastic strain; acoustic emission; unloading modulus; damage
(1) Peijian Jin:
School of Municipal & Environmental Engineering, Jilin Jianzhu University, Changchun, Jilin 130118, China;
(2) Enyuan Wang, Dazhao Song:
College of Safety Engineer, China University of Mining and Technology, Xuzhou, Jiangsu 221116, China.

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