Scholarlink

<p>To investigate the catastrophic instability mechanisms of roadway roof and sidewall rock masses under deep-hole roof blasting in coal mines, this study establishes potential energy functions and instability criteria models for layered roof and sidewall strata based on cusp catastrophe theory. First, the layered roof is idealized as a simply supported beam. Considering the coupling effects of deep-hole blasting loads, rock mechanical properties, and support resistance, a total potential energy equation for the system is derived, and the cusp catastrophe equation along with sufficient and necessary conditions for instability are obtained. Second, for the roadway sidewall, a tensile-shear coupled sliding failure mechanical model is proposed to analyze the influence of blasting loads on sidewall stability, and a corresponding catastrophe instability criterion is developed. Through theoretical derivation, the critical maximum explosive charge for both the layered roof and sidewall rock masses is formulated, along with a mechanical criterion for instability judgment. Finally, taking the lower roadway of the 2205 working face in Songshan Coal Mine as the engineering background, theoretical calculations indicate that the maximum critical explosive charge for the roadway is 93.3&#xa0;kg. Field monitoring shows that, within 1&#xa0;day after blasting, the roof subsidence increased by 5&#xa0;mm and the convergence of the two sidewalls increased by 11&#xa0;mm, indicating that the roadway was only slightly affected by roof deep-hole blasting.This work provides a theoretical basis and engineering guidance for the prediction and control of roadway rock instability under deep-hole roof blasting conditions.</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

Catastrophic instability criterion for roadway roof and sidewall rock mass under deep-hole roof blasting in Songshan coal mine

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年1月28日

查看全文
  • Dongming Guo,
  • Jin Chen,
  • Hengkai Wang,
  • Zhonghua Wei,
  • Qingli Gao

摘要

To investigate the catastrophic instability mechanisms of roadway roof and sidewall rock masses under deep-hole roof blasting in coal mines, this study establishes potential energy functions and instability criteria models for layered roof and sidewall strata based on cusp catastrophe theory. First, the layered roof is idealized as a simply supported beam. Considering the coupling effects of deep-hole blasting loads, rock mechanical properties, and support resistance, a total potential energy equation for the system is derived, and the cusp catastrophe equation along with sufficient and necessary conditions for instability are obtained. Second, for the roadway sidewall, a tensile-shear coupled sliding failure mechanical model is proposed to analyze the influence of blasting loads on sidewall stability, and a corresponding catastrophe instability criterion is developed. Through theoretical derivation, the critical maximum explosive charge for both the layered roof and sidewall rock masses is formulated, along with a mechanical criterion for instability judgment. Finally, taking the lower roadway of the 2205 working face in Songshan Coal Mine as the engineering background, theoretical calculations indicate that the maximum critical explosive charge for the roadway is 93.3 kg. Field monitoring shows that, within 1 day after blasting, the roof subsidence increased by 5 mm and the convergence of the two sidewalls increased by 11 mm, indicating that the roadway was only slightly affected by roof deep-hole blasting.This work provides a theoretical basis and engineering guidance for the prediction and control of roadway rock instability under deep-hole roof blasting conditions.