Rock and Soil Mechanics ›› 2019, Vol. 40 ›› Issue (11): 4203-4212.doi: 10.16285/j.rsm.2018.192

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Energy dissipation feature and rock burst risk assessment in coal-rock combinations

XIAO Xiao-chun1, 2, FAN Yu-feng3, WU Di3, DING Xin3, WANG Lei3, ZHAO Bao-you3   

  1. 1. School of Civil Engineering, Shaoxing University, Shaoxing, Zhejiang 312000, China; 2. Key Laboratory of Rock Mechanics and Geohazards of Zhejiang Province, Shaoxing University, Shaoxing, Zhejiang 312000, China; 3. School of Mechanics and Engineering, Liaoning Technical University, Fuxin, Liaoning 123000, China
  • Received:2018-10-19 Online:2019-11-11 Published:2019-11-12
  • Supported by:
    This work was supported by the National Natural Science Foundation of China(51774164，51974186，51974147).

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Abstract: To explore the energy dissipation of coal-rock combinations failure, uniaxial compression experiments were conducted to investigate the failure process characteristics in terms of the energy. Meanwhile, the relationships of failure and acoustic emission signal were discussed based on fractal dimension. Method for evaluating the risk of rock burst was proposed, based on the investigation of the different combination structures influence on energy dissipation of coal-rock combination. The results show that when the rock height increases, the strength and elastic modulus increase, and the softening process decreases. The raise of rock height could increase the impact risk, as well as the reduction of difference between the elastic modulus of rock and coal. In addition, a new decision method was proposed based on the analyses of height and mechanical properties of coal-rock combination, compared with the “four index” of traditional fuzzy evaluation. The result of assessing the rock burst index by the decision method has higher accuracy and practicability. These results provide the data and theoretical support for further development study of rock burst risk in coal-rock combinations.

Key words: coal-rock combination, energy dissipation, mechanics property, fractal dimension, acoustic emission, rock burst risk

CLC Number: 

  • TU 45
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