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

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• 作者：Yi Xue ; Feng Gao ; Teng Teng ; Yan Xing
• 关键词：Gas pressure ; Rock burst ; Energy dissipation ; Failure mode
• 刊名：Geotechnical and Geological Engineering
• 出版年：2016
• 出版时间：December 2016
• 年：2016
• 卷：34
• 期：6
• 页码：1737-1748
• 全文大小：1,471 KB
• 刊物类别：Earth and Environmental Science
• 刊物主题：Earth sciences
  Geotechnical Engineering
  Hydrogeology
  Terrestrial Pollution
  Waste Management and Waste Technology
  Civil Engineering
  
• 出版者：Springer Netherlands
• ISSN：1573-1529
• 卷排序：34

文摘

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.