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<p>To research the coal’s dynamic response and energy-induced disaster features under complex geology conditions, impact assays were executed among coal specimens under coupling conditions of different temperatures and nitrogen pressures using a visualized thermo-pneumatic coupled SHPB system. The results show that the impact strain evolution of coal mass under the thermo-gas coupling environment presents a three-stage characteristic (slow increase-rapid rise-leveling off). Impact velocity, gas pressure, and temperature realize differentiated regulation of coal dynamic response through dynamic driving, confining pressure constraint, and thermal degradation effect, respectively. The regulation mechanisms of single-field parameters on energy evolution are different: the rise in impact velocity strengthens energy input, inhibits energy storage, and accelerates energy dissipation; gas pressure raises the energy threshold of coal mass failure through the confining pressure constraint effect; the increase in temperature reduces the coal’s mechanical strength and energy threshold through the thermal deterioration effect. Gas pressure and temperature show an antagonistic effect on regulating the coal’s energy evolution, and the impact velocity amplifies their coupling result. Under the coupling of the three factors, coal mass exhibit the characteristics of inelastic energy storage residue and total energy dissipation failure, which is the core energy mechanism for the sudden occurrence of dynamic disasters in deep coal seams. This study can provide engineering references for precisely preventing dynamic disasters among coal seams with high ground temperature and high gas content.</p>

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Dynamic response and energy dissipation-transfer characteristics of coal subjected to impact loading under coupled thermo-gas-stress conditions

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年7月21日

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  • Kai Wang,
  • Jinwen Bai,
  • Guorui Feng,
  • Penghua Han,
  • Ruipeng Qian

摘要

To research the coal’s dynamic response and energy-induced disaster features under complex geology conditions, impact assays were executed among coal specimens under coupling conditions of different temperatures and nitrogen pressures using a visualized thermo-pneumatic coupled SHPB system. The results show that the impact strain evolution of coal mass under the thermo-gas coupling environment presents a three-stage characteristic (slow increase-rapid rise-leveling off). Impact velocity, gas pressure, and temperature realize differentiated regulation of coal dynamic response through dynamic driving, confining pressure constraint, and thermal degradation effect, respectively. The regulation mechanisms of single-field parameters on energy evolution are different: the rise in impact velocity strengthens energy input, inhibits energy storage, and accelerates energy dissipation; gas pressure raises the energy threshold of coal mass failure through the confining pressure constraint effect; the increase in temperature reduces the coal’s mechanical strength and energy threshold through the thermal deterioration effect. Gas pressure and temperature show an antagonistic effect on regulating the coal’s energy evolution, and the impact velocity amplifies their coupling result. Under the coupling of the three factors, coal mass exhibit the characteristics of inelastic energy storage residue and total energy dissipation failure, which is the core energy mechanism for the sudden occurrence of dynamic disasters in deep coal seams. This study can provide engineering references for precisely preventing dynamic disasters among coal seams with high ground temperature and high gas content.