Geotechnical and Geological Engineering

, Volume 34, Issue 6, pp 1737–1748 | Cite as

Effect of Gas Pressure on Rock Burst Proneness Indexes and Energy Dissipation of Coal Samples

Original paper
First Online:
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Accepted:

Abstract

To investigate the influence of gas pressure on rock burst proneness of coal, the rock burst proneness tests were conducted under different gas pressures. Based on the energy method, the rock burst proneness and energy accumulation law are analyzed. The following conclusions can be drawn: (1) The change laws of impact energy index, the effective impact energy index and the residual energy index are consistent, reducing with the increase of gas pressure. (2) Before the coal failure, the total energy, the elastic energy, and the dissipated energy of coal specimens increase with the increase of the stress. The increase speed of total energy is the fastest, the elastic energy takes the second place, and the dissipated energy is the slowest. (3) The failure energy ratio and stress drop coefficient defined by energy can be used to describe the rock burst proneness. (4) The failure modes of coal samples transform from brittle failure into ductile shear failure with the increase of gas pressure. (5) In the coal seam which has typical dynamic hazards, there is a critical value of gas pressure. When the gas pressure is higher than the critical value, gas outburst is the main disaster. When the gas pressure is lower than the critical value, the rock burst is the main disaster.

Keywords

Gas pressure Rock burst Energy dissipation Failure mode 
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Notes

Acknowledgments

The authors are grateful to the financial support from the National Natural Science Foundation of China (51404250), the Natural Science Foundation of Jiangsu, China (BK20140189), the China Postdoctoral Science Foundation (2014M550315) and the College Graduate Research and Innovation Program of Jiangsu Province (KYLX15_1408).

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Copyright information

© Springer International Publishing Switzerland 2016

Authors and Affiliations

  1. 1.State Key Laboratory for Geomechanics and Deep Underground EngineeringChina University of Mining and TechnologyXuzhouChina
  2. 2.Rock Mass Modeling and Computational Rock Mechanics LaboratoriesUniversity of ArizonaTucsonUSA

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