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Quantitative Characteristics of Energy Evolution of Gas-Bearing Coal Under Cyclic Loading and its Action Mechanisms on Coal and Gas Outburst

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Abstract

It is very important and effective to characterize the failure mechanism of coal and rock materials from the perspective of energy. Energy dissipation and release are important causes of rock mass failure. To qualitatively and quantitatively characterize the energy evolution process of gas-bearing coal and the energy evolution mechanisms of coal and gas outburst, experimental studies were conducted on gas-bearing coal under different stress paths. The research results demonstrate that the energy evolution of gas-bearing coal has nonlinear characteristics and that the energy density is a quadratic function of stress. The total energy density is mainly stored as elastic energy density and is unrelated to loading paths. According to the distribution characteristics of abutment pressures in a stope, the energy distribution can be divided into an energy dissipation and release zone, an increasing-energy zone, and a stable energy storage zone. During coal mining, abutment pressure in front of the coal wall is an important factor causing energy accumulation, and the stress concentration area is a key area to prevent and control dynamic disasters of coal and rock masses. Furthermore, based on the principle of energy conservation, this study established an energy balance model for coal and gas outburst and derived energy criteria for coal and gas outburst. When \(\Upsilon > 1\), there is a risk of coal seams have outburst. If \(\Upsilon = 1\), the system is in a state of limit equilibrium, and mining disturbances could trigger outburst.

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Acknowledgements

This paper is supported by the National Natural Science Foundation of China (51974043, 52074041, 51774058, and 51974359), Natural Science Foundation of Chongqing, China (cstc2020jcyj-msxmX0836),  Science & Technology Foundation of Guizhou Province ([2020]4Y050), the Research Fund of Key Laboratory of Mining Disaster Prevention and Control, Shandong University of Science and Technology (MDPC202001), Basic Scientific Research Operating Expenses of Central Universities (2020CDJQY-A048), and the Fundamental Research Funds for the Central Universities (2020CDJ-LHZZ-002).

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Authors and Affiliations

  1. State Key Laboratory of Coal Mine Disaster Dynamics and Control, School of Resources and Safety Engineering, Chongqing University, Chongqing, 400044, China

    Kang Peng, Shaowei Shi, Quanle Zou & Yunqiang Wang

  2. School of Resources and Safety Engineering, Central South University, Changsha, 410083, Hunan, China

    Kang Peng

  3. Key Laboratory of Mining Disaster Prevention and Control, Shandong University of Science and Technology, Qingdao, 266590, China

    Zhijie Wen

  4. School of Mines, Guizhou University, Guiyang, 550025, China

    Zebiao Jiang

  5. School of Energy and Safety Engineering, Anhui University of Science and Technology, Huainan, 232001, Anhui, China

    Chunshan Zheng

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  1. Kang Peng
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Correspondence to Quanle Zou or Zhijie Wen.

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Peng, K., Shi, S., Zou, Q. et al. Quantitative Characteristics of Energy Evolution of Gas-Bearing Coal Under Cyclic Loading and its Action Mechanisms on Coal and Gas Outburst. Rock Mech Rock Eng 54, 3115–3133 (2021). https://doi.org/10.1007/s00603-021-02446-7

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