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Destabilization mechanism and energy evolution of coal pillar in rockburst disaster

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Abstract

Rockburst disaster caused by coal pillar poses a serious threat to safety production in advanced mining technology, such as the technology of gob-side entry driving, which is employed to develop the mining rate of coal. In order to reveal the rockburst mechanism of coal pillar in mines from the view of energy evolution, the bursting liability of coal specimen is tested in a mine, where a rockburst of coal pillar happens in the third cycle of 6 # roadway excavation. The rockburst mechanism of the coal pillar is analyzed theoretically and simulated by FLAC. On this basis, an evaluation standard of energy density is proposed and realized for risk assessment of rockburst. Then, numerical models with two types are established, and the trend characteristics of energy density factor and vertical stress in two scheme types are studied. Based on research results obtained, the weak impact tendency of coal specimen and the moderate impact danger level of mining face are internal causes for rockburst disaster in roadway backfilling mining; meanwhile, the maximum value 51,351 J/m4 of energy density factor in coal pillar of 6 # roadway in un-backfilling mining scheme is 3.33 times that of 15,403 J/m4 in backfilling mining scheme, and the rockburst disaster happens in the 6 # roadway excavation when elastic deformation energy reserved in coal pillar is released suddenly. The research results could provide a theoretical reference for the prevention and control of the rockburst disaster in mining engineering.

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Funding

This work was supported by the Program for Science & Technology Innovation Talents in Universities of Henan Province (19HASTIT047), the Science and Technology Project of Henan Province (182102310012), the National Natural Science Foundation of China (51774110), the State Key Laboratory Cultivation Base for Gas Geology and Gas Control (WS2019B01), the Project Supported by Natural Science Basic Research Plan in Shaanxi Province of China (2019JQ-275), the China Postdoctoral Science Foundation (2019T120929 and 2018M633549), the Postdoctoral Research Projects of Shaanxi Province (2018BSHTDZZ03), the Fundamental Research Funds for the Universities of Henan Province (NSFRF200302), the Scientific and Technological Development Project for Coal Mine Safety Production by Henan Province (HN19-59), the Postdoctoral Research Projects of Henan Province, the Natural Science Foundation of Henan Province, and the Foundation for Higher Education Key Research Project by Henan Province (19A130001).

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Authors and Affiliations

  1. Institute of Geotechnical Engineering, State Key Laboratory of Eco-hydraulics in Northwest Arid Region, Xi’an University of Technology, Xi’an, 710048, China

    Yi Xue

  2. State Key Laboratory Cultivation Base for Gas Geology and Gas Control, Henan Polytechnic University, Jiaozuo, 454003, China

    Yi Xue, Zhengzheng Cao & Zhenhua Li

  3. International Joint Research Laboratory of Henan Province for Underground Space Development and Disaster Prevention, Henan Polytechnic University, Jiaozuo, 454003, China

    Zhengzheng Cao

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  1. Yi Xue
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  2. Zhengzheng Cao
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Correspondence to Zhengzheng Cao or Zhenhua Li.

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The authors declare that they have no competing interests.

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Responsible Editor: Murat Karakus

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Xue, Y., Cao, Z. & Li, Z. Destabilization mechanism and energy evolution of coal pillar in rockburst disaster. Arab J Geosci 13, 557 (2020). https://doi.org/10.1007/s12517-020-05584-4

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  • DOI: https://doi.org/10.1007/s12517-020-05584-4

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