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Volume 37 Issue 10
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JIANG Fu-xing, FENG Yu, KOUAME K J A. Mechanism of creep-induced rock burst in extra-thick coal seam under high ground stress[J]. Chinese Journal of Geotechnical Engineering, 2015, 37(10): 1762-1768. DOI: 10.11779/CJGE201510003
Citation: JIANG Fu-xing, FENG Yu, KOUAME K J A. Mechanism of creep-induced rock burst in extra-thick coal seam under high ground stress[J]. Chinese Journal of Geotechnical Engineering, 2015, 37(10): 1762-1768. DOI: 10.11779/CJGE201510003
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Mechanism of creep-induced rock burst in extra-thick coal seam under high ground stress

  • 1. State Key Laboratory of High-Efficient Mining and Safety of Metal Mines, Ministry of Education, University of Science and Technology Beijing, Beijing 100083, China;
    2. School of Civil and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China

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  • Received Date: November 14, 2014
  • Published Date: October 19, 2015
    Graphical Abstract
    • Abstract
  • A number of creep-induced rock bursts suggest that this type of rock burst belongs to hidden disasters featuring spontaneity and time delay. Lacking knowledge of its mechanism leads to challenging rock burst prevention and control, posing a severe threat to deep mining safety of extra-thick coal seam. Creep-induced rock burst is closely related to unstable creep. By establishing a creep model and a three-dimensional creep equation, it is found that high ground stress and extra-thick coal seam provide favorable conditions for its formation. The breaking process of roadway surrounding rock due to unstable creep is studied, and it is found that unstable creep activates rock burst and reduces resistance through strength corrosion and stress relief, thus inducing rock burst in weak areas of roadway by the impact of external static stress. An estimation formula for assessing possibility of creep-induced rock bursts is proposed. Based on the mechanism of creep-induced rock bursts, some specific measures of prevention and control are put forward: optimization of roadway layout, strengthening of active support, optimization of pressure relief parameters and long-term stress monitoring.
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    • References (19)
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