Abstract Coal and gas outburst is a typical dynamic disaster occurring during coal mining. To analyze its multi-field coupling mechanism, in this study, a multi-field (including coal stress field, damage field, gas diffusion field and seepage field) coupling model was established based on the heterogeneity of coal, and the mining process of horizontal and coal seam with fault were numerically simulated. Besides, the evolution of gas pressure, von mises stress and permeability under different parameters were analyzed. The results show that the stress relief zone in front of the working face is damaged by the mining disturbance, and the permeability increases sharply due to the full development of internal fractures. The coal in the stress concentration zone is affected by the stress concentration, which leads to the closure of fracture and the sharp decrease of permeability. As a result, the gas pressure gradient between stress relief zone and stress concentration zone increases, thus raising the risk of coal and gas outburst. The front geological structure of working face leads to the formation of multiple stress concentration zones in the coal seam, and the risk of coal and gas outburst increases with the increase of overburden stress. Based on the interaction between geological structure, gas pressure, coal mechanical properties and overburden stress, the mechanism of coal and gas outburst can be revealed. The research results can provide theoretical guidance for disaster prevention of coal and gas outburst.

中文翻译：

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扰动煤层多场耦合诱发突出机理

摘要 煤与瓦斯突出是煤矿开采过程中发生的典型动态灾害。为分析其多场耦合机理，本研究基于煤的非均质性，结合水平井开采过程，建立了多场（包括煤应力场、损伤场、瓦斯扩散场和渗流场）耦合模型。并对断层煤层进行数值模拟。此外，还分析了不同参数下气体压力、von mises应力和渗透率的演变。结果表明，工作面前方应力释放带受到开采扰动破坏，内部裂缝充分发育，渗透率急剧增加。应力集中区煤体受应力集中影响，导致裂缝闭合，渗透率急剧下降。因此，应力释放带和应力集中带之间的瓦斯压力梯度增大，从而增加了煤和瓦斯突出的风险。工作面前缘地质构造导致煤层内形成多个应力集中区，煤与瓦斯突出的风险随着上覆应力的增加而增加。通过地质构造、瓦斯压力、煤体力学特性和上覆应力相互作用，揭示煤与瓦斯突出的机理。研究成果可为煤与瓦斯突出灾害防治提供理论指导。应力释放带和应力集中带之间的瓦斯压力梯度增大，从而增加了煤和瓦斯突出的风险。工作面前缘地质构造导致煤层内形成多个应力集中区，煤与瓦斯突出的风险随着上覆应力的增加而增加。通过地质构造、瓦斯压力、煤体力学特性和上覆应力相互作用，揭示煤与瓦斯突出的机理。研究成果可为煤与瓦斯突出灾害防治提供理论指导。应力释放带和应力集中带之间的瓦斯压力梯度增大，从而增加了煤和瓦斯突出的风险。工作面前缘地质构造导致煤层内形成多个应力集中区，煤与瓦斯突出的风险随着上覆应力的增加而增加。通过地质构造、瓦斯压力、煤体力学特性和上覆应力相互作用，揭示煤与瓦斯突出的机理。研究成果可为煤与瓦斯突出灾害防治提供理论指导。煤和瓦斯突出的风险随着上覆应力的增加而增加。通过地质构造、瓦斯压力、煤体力学特性和上覆应力相互作用，揭示煤与瓦斯突出的机理。研究成果可为煤与瓦斯突出灾害防治提供理论指导。煤和瓦斯突出的风险随着上覆应力的增加而增加。通过地质构造、瓦斯压力、煤体力学特性和上覆应力相互作用，揭示煤与瓦斯突出的机理。研究成果可为煤与瓦斯突出灾害防治提供理论指导。