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<p>This study aimed to enhance the quantitative comprehension of the mechanisms underlying coal–gas compound dynamic disasters (referred to as “compound disasters”) from an energy perspective. First, theoretical analysis and modeling methods were employed to propose a framework for elucidating the energy on control function of compound disasters. For this reason, a refined gas expansion energy model was derived, and its superiority was verified. An elastic energy model incorporating the effect of gas was established, allowing the comparison of elastic energy and gas expansion energy in the same coordinate system. Laboratory experiments were conducted on destabilizing gas-containing coal–roof systems under different gas pressure levels. The experimental results validated the control function of energy in compound disasters and revealed the distribution characteristics of ejected coal powder. Finally, the critical gas pressure of compound disasters in Xin’an Coal Mine was analyzed based on the control function of energy on compound disasters, and the influence of various factors on compound disasters was discussed quantitatively. The results demonstrated that differences in gas expansion energy and elastic residual energy determined the type of disaster. When these energy differences lacked an order-of-magnitude distinction during disaster initiation, the event was classified as a compound disaster. Coal powder distribution in compound disasters and coal and gas outbursts was categorized into near, middle, and far zones. A significant difference in the distribution of extreme coal powder levels was observed between the two types of disaster within the middle region: compound disasters exhibited less extreme coal powder levels than coal–gas outbursts. The critical gas pressure for compound disasters in Xin'an Coal Mine, determined using the derived energy model, ranged from 0.4 to 0.74&#xa0;MPa, which aligned with actual observations. The energy control mechanism of compound disasters could effectively identify compound disasters and facilitate the application of targeted comprehensive measures.</p>

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Mechanisms of Energy Release in Fracture and Gas Expansion-Driven Instabilities of Coal–Rock Composite Structure: Theoretical Modeling and Experimental Validation

  • 期刊论文

  • 发表日期：

    2025年3月8日

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  • Kai Wang,
  • Jiazhi Sun,
  • Feng Du,
  • Xiang Zhang,
  • Kangnan Li,
  • Xiaohuan Zuo,
  • Dongxu Wang

摘要

This study aimed to enhance the quantitative comprehension of the mechanisms underlying coal–gas compound dynamic disasters (referred to as “compound disasters”) from an energy perspective. First, theoretical analysis and modeling methods were employed to propose a framework for elucidating the energy on control function of compound disasters. For this reason, a refined gas expansion energy model was derived, and its superiority was verified. An elastic energy model incorporating the effect of gas was established, allowing the comparison of elastic energy and gas expansion energy in the same coordinate system. Laboratory experiments were conducted on destabilizing gas-containing coal–roof systems under different gas pressure levels. The experimental results validated the control function of energy in compound disasters and revealed the distribution characteristics of ejected coal powder. Finally, the critical gas pressure of compound disasters in Xin’an Coal Mine was analyzed based on the control function of energy on compound disasters, and the influence of various factors on compound disasters was discussed quantitatively. The results demonstrated that differences in gas expansion energy and elastic residual energy determined the type of disaster. When these energy differences lacked an order-of-magnitude distinction during disaster initiation, the event was classified as a compound disaster. Coal powder distribution in compound disasters and coal and gas outbursts was categorized into near, middle, and far zones. A significant difference in the distribution of extreme coal powder levels was observed between the two types of disaster within the middle region: compound disasters exhibited less extreme coal powder levels than coal–gas outbursts. The critical gas pressure for compound disasters in Xin'an Coal Mine, determined using the derived energy model, ranged from 0.4 to 0.74 MPa, which aligned with actual observations. The energy control mechanism of compound disasters could effectively identify compound disasters and facilitate the application of targeted comprehensive measures.