Abstract
Based on thermal–fluid–solid coupling law in coal and gas outburst, a multi-physical field numerical analysis model is built for the whole outburst process. The response laws of stress, gas pressure, temperature, and seepage in different areas and different time nodes around coal and rock mass in the coal and gas outburst under high stress condition are discussed. Research results show: Firstly, the stress response law of the coal and rock mass around the burst hole is initial vibration–sudden attenuation–late stability. Secondly, the gas pressure response law in different areas is that the gas pressure response rate decreases gradually with the increase of the distance from the outburst. Thirdly, the adsorbed gas contained in the broken coal near the outburst port is desorbed rapidly and expands to do work, and the temperature changes dramatically after outburst occurs. In contrast, with the increase of stress, the proportion of elastic potential in total coal and gas outburst energy increases, and the proportion of elastic potential is positively correlated with stress. The critical gas pressure under the energy condition of coal and gas outburst decreases with the increase of stress. It illustrates that the lower gas pressure can also meet the energy condition of coal and gas outburst under high stress.
Highlights
With the depletion of coal resources in shallow mines and the increasing instability of world energy, mining operations inevitably develop gradually from shallow mining to deep mining [1,2,3,4,5]
In the case of gas extraction up to standard, coal and gas outburst accidents still occur frequently under deep high stress condition, which has seriously restricted the safety of coal mining [18]
It is of great significance to study stress, gas and coal coupling mechanism, and coal and gas outburst theory under high stress in deep mining [19,20,21,22,23,24,25,26]
Summary
With the depletion of coal resources in shallow mines and the increasing instability of world energy, mining operations inevitably develop gradually from shallow mining to deep mining [1,2,3,4,5]. In the case of gas extraction up to standard, coal and gas outburst accidents still occur frequently under deep high stress condition, which has seriously restricted the safety of coal mining [18]. It is of great significance to study stress, gas and coal coupling mechanism, and coal and gas outburst theory under high stress in deep mining [19,20,21,22,23,24,25,26]. Taking the outburst accident in Dingji Coal Mine as the prototype, numerical simulation was used to study multiple physical field response parameters in the whole coal and gas outburst process, providing a reference for the prediction and prevention of deep coal and gas outburst
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
