Outburst energy is a major factor influencing coal and gas outbursts, albeit its estimation is difficult owing to the lack of amenable means for quantification of gas desorption. In the past decades, determining the mechanism of outbursts is one of the most challenging issues in rock mechanics. In this study, a triaxial coal and gas outburst simulation system was employed to perform simulated experiments using He (to rule out the influence from gas ad-desorption), N2, and CO2. This facilitated understanding of the energy principle underlying the said outbursts and evaluation of the effects of gas desorption on outburst development. Results of this study indicate that outburst energy and energy consumption are influenced by several factors, including outburst pressure, outburst intensity, ejection distance, and particle size of ejected coal. Among these, gas desorption demonstrates the greatest influence when performing controlled tests (using He). Considering the effects of gas desorption, the total outburst energy can be increased by 1.35–2.95 times, thereby causing an enormous increase in the destructive potential of outbursts. Additionally, values of the coal crushing and transport energies can be enhanced by the order of 118.9–206.6% and 157.8–406.6%, respectively, thereby resulting in a stronger conveying capacity of outburst coal–gas flow along with severe coal fragmentation. A further analysis of the energy distribution indicated that in the development stage, gas desorbed from coal acts as the force driving coal transport, whereas free gas energy is mainly consumed during coal crushing. Findings of this study highlight the importance of quantifying contributions of coal gas towards effective interpretation of outburst-causing mechanisms.

中文翻译：

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煤与瓦斯突出的能量原理：瓦斯解吸作用的实验评价

突出能量是影响煤和瓦斯突出的主要因素，尽管由于缺乏对瓦斯解吸进行量化的可行方法，它的估计很困难。在过去的几十年里，确定突出的机制是岩石力学中最具挑战性的问题之一。在这项研究中，采用三轴煤和瓦斯突出模拟系统进行了使用 He（排除瓦斯吸附解吸的影响）、N2 和 CO2 的模拟实验。这促进了对上述爆发背后的能量原理的理解以及对气体解吸对爆发发展的影响的评估。研究结果表明，突出能量和能源消耗受多个因素的影响，包括突出压力、突出强度、喷射距离和喷射煤的粒度。其中，在进行受控测试（使用 He）时，气体解吸的影响最大。考虑到气体解吸的影响，总爆发能量可提高1.35～2.95倍，从而使爆发的破坏潜力大大增加。此外，煤炭破碎和输送能量值分别提高了 118.9-206.6% 和 157.8-406.6%，从而导致突出煤-气流的输送能力更强，同时煤炭破碎严重。对能量分布的进一步分析表明，在开发阶段，从煤中解吸的气体是推动煤炭运输的动力，而游离气体能量主要在煤炭破碎过程中消耗。