›› 2012, Vol. 33 ›› Issue (1): 233-237.

• Geotechnical Engineering • Previous Articles     Next Articles

Study of EME rules during coal or rock mass failure base on energy theory

YAO Jing-ming1，YAN Yong-ye2，LIU Xi-qian1，YAO Jun-wei1，DOU Lin-ming3   

  1. 1. State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, China; 2. School of Mechanics and Electronics, Henan Institute of Science and Technology, Xinxiang, Henan 453003, China; 3. School of Mines, China University of Mining and Technology, Xuzhou, Jiangsu 221008, China
  • Received:2010-09-26 Online:2012-01-10 Published:2012-01-17

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Abstract: To provide the theorical basis for electromagnetic emission (EME) forecasting dynamic disasters of the coal or rock mass, the relations between EME energy and loading mechanical energy are analyzed preliminarily by the theory of electromagnetic wave and damage mechanics. The coupling relations between EME and energy accumulation during the deformation and failure of coal under uniaxial compression are investigated by laboratory tests and the energy theory. The results show that: the relations between loading mechanical energy and EME energy during the deformation and failure of the coal sample is positive linearity, and the ratio is 0.1074 times with elastic modulus of coal samples; the EME energy is not only proportional to peak elastic strain energy of coal, but also proportional to the impact energy index of coal. The EME signal reflected the difficulty level of the coal dynamic damage, Therefore, the EME can forecast dynamic disasters of coal or rock mass.

Key words: electromagnetic emission, uniaxial compression, emission energy, rule

CLC Number: 

  • TD 324
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