Analysis of Energy Accumulation and Dissipation of Coal Bursts
Abstract
:1. Introduction
2. Energy Forms and the Energy Conservation Equation
3. Energy Accumulation
3.1. Mining Depth
3.2. Stiffness
3.3. Seismicity
3.4. Elasticity
4. Energy Dissipation
4.1. Bulking
4.2. Acoustic Events
5. Conclusions
- Generally, destruction and safety hazards are caused by ejection energy, as a result of the transformation of elastic energy. The accumulation of elastic energy in coal is dominated by geological conditions, such as mining depth, surrounding rock stiffness, seismicity events, and its mechanical properties. Mining depth and seismicity events are sources of energy caused by static loads and dynamic loads, respectively. The influence of these factors on the accumulation of elastic energy was established through energy analysis.
- According to the analysis of stiffness, energy flows from the surrounding rock (high stiffness) to the coal (low stiffness). Hence, for coalmines with stiff roofs and floors, the elastic energy tends to concentrate in the coal seam.
- The elasticity of coal is determined by its capacity and ability to store elastic energy. It is recommended from our laboratory tests that the ability of coal seams to store elastic energy should be evaluated using the coal-burst propensity index prior to commencing the extraction of long-wall faces or roadways. Australian coalmines can determine their potential risk of coal bursts according to the results of the coal-burst propensity evaluation and other geological conditions.
- Some audible or visible phenomena, such as bulking and acoustic events, may appear prior to the occurrence of coal bursts. These phenomena indicate a concentration of high energy in the body of the coal, suggesting the possibility of coal bursts in the near future.
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Yang, X.; Ren, T.; Remennikov, A.; He, X.; Tan, L. Analysis of Energy Accumulation and Dissipation of Coal Bursts. Energies 2018, 11, 1816. https://doi.org/10.3390/en11071816
Yang X, Ren T, Remennikov A, He X, Tan L. Analysis of Energy Accumulation and Dissipation of Coal Bursts. Energies. 2018; 11(7):1816. https://doi.org/10.3390/en11071816
Chicago/Turabian StyleYang, Xiaohan, Ting Ren, Alex Remennikov, Xueqiu He, and Lihai Tan. 2018. "Analysis of Energy Accumulation and Dissipation of Coal Bursts" Energies 11, no. 7: 1816. https://doi.org/10.3390/en11071816