Scholarlink

<p>The breaking and weighting of thick-hard roofs in coal mines, often triggered by high-intensity mining, can induce dynamic disasters such as spalling rock bursts in the working face. This paper investigates the disaster-causing mechanism of spalling rock bursts in the working face using a folding catastrophe model. By developing a mechanical model of a two-body system, consisting of a thick-hard roof and a cracked coal panel, the study analyzes the relationship between energy accumulation, dissipation, and the energy balance equation. The dynamic instability mechanism of the cracked coal panel is further explored using folding catastrophe theory. The results show that the cracked coal panel is subjected to dynamic impact loads until it reaches peak stress, after which it enters the post-peak strain-softening stage during the roof’s weighting process. When the released elastic strain energy exceeds the energy required for the quasi-static fracture of the cracked coal panel, the excess energy is rapidly converted into kinetic energy, leading to dynamic instability. This process indicates that loading the cracked coal panel to the strain-softening stage by the dynamic breaking and weighting of the thick-hard roof is a sufficient condition for instability, while the post-peak strain-softening characteristics of the panel and the stiffness parameters of the two-body system are necessary conditions for dynamic instability. Furthermore, the study discusses the influence of stiffness parameters on the dynamic instability behavior of the cracked coal panel. When the system’s stiffness parameter is greater than or equal to 1, the equilibrium position transitions smoothly from an unstable state to failure, resulting in quasi-static fracture of the cracked coal panel. However, when the stiffness parameter is less than 1, a sudden shift from an unstable equilibrium state to a stable one occurs, triggering dynamic instability and spalling rock bursts. In addition, the critical displacement, the abrupt change before and after instability, and the total released energy are closely tied to the roof stiffness and the damage constitutive curve of the cracked coal panel. This research provides a significant mechanical and theoretical foundation for better understanding and preventing spalling rock bursts in coal mines.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Disaster-Causing Mechanism of Spalling Rock Burst Based on Folding Catastrophe Model in Coal Mine

  • 期刊论文

  • 发表日期：

    2025年3月22日

查看全文
  • Zhengzheng Cao,
  • Shuaiyang Zhang ,
  • Yi Xue,
  • Zhengxin Wang,
  • Feng Du,
  • Zhenhua Li,
  • Cunhan Huang,
  • Shuren Wang,
  • Yongqiang Yu,
  • Wenqiang Wang,
  • Minglei Zhai

摘要

The breaking and weighting of thick-hard roofs in coal mines, often triggered by high-intensity mining, can induce dynamic disasters such as spalling rock bursts in the working face. This paper investigates the disaster-causing mechanism of spalling rock bursts in the working face using a folding catastrophe model. By developing a mechanical model of a two-body system, consisting of a thick-hard roof and a cracked coal panel, the study analyzes the relationship between energy accumulation, dissipation, and the energy balance equation. The dynamic instability mechanism of the cracked coal panel is further explored using folding catastrophe theory. The results show that the cracked coal panel is subjected to dynamic impact loads until it reaches peak stress, after which it enters the post-peak strain-softening stage during the roof’s weighting process. When the released elastic strain energy exceeds the energy required for the quasi-static fracture of the cracked coal panel, the excess energy is rapidly converted into kinetic energy, leading to dynamic instability. This process indicates that loading the cracked coal panel to the strain-softening stage by the dynamic breaking and weighting of the thick-hard roof is a sufficient condition for instability, while the post-peak strain-softening characteristics of the panel and the stiffness parameters of the two-body system are necessary conditions for dynamic instability. Furthermore, the study discusses the influence of stiffness parameters on the dynamic instability behavior of the cracked coal panel. When the system’s stiffness parameter is greater than or equal to 1, the equilibrium position transitions smoothly from an unstable state to failure, resulting in quasi-static fracture of the cracked coal panel. However, when the stiffness parameter is less than 1, a sudden shift from an unstable equilibrium state to a stable one occurs, triggering dynamic instability and spalling rock bursts. In addition, the critical displacement, the abrupt change before and after instability, and the total released energy are closely tied to the roof stiffness and the damage constitutive curve of the cracked coal panel. This research provides a significant mechanical and theoretical foundation for better understanding and preventing spalling rock bursts in coal mines.