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<p>Deep mining beyond 1000&#xa0;m exposes anchored roadways to elevated ground pressure and temperature, threatening surrounding rock stability. This study investigated the mechanical behavior and damage characteristics of coal under uniaxial dynamic loading at drying temperatures (20–120&#xa0;°C) and anchored conditions, focusing on their coupled effects on peak stress, energy conversion, and crack propagation. The results demonstrated that, as drying temperature increases, there was a gradual rise in peak stress for coal specimens, accompanied by substantial reflection energy and progressive development of axial splitting cracks in post-failure stage. When drying temperature exceeded 80&#xa0;°C, structural damage occurred within coal specimens, leading to secondary crack propagation along with central cracking, which further combined with it. This process significantly shortened the dynamic change duration of specimens while increasing both peak stress and transmitted energy, ultimately reducing bearing capacity. Under anchored conditions, this phenomenon occurred prematurely when drying temperature surpassed 60&#xa0;°C. By employing Weibull distribution theory and an overstress model, a constitutive model integrating thermal and anchorage influences was developed, clarifying coal’s fracture mechanics under thermo-anchored coupling. Its accuracy was verified with experimental findings. The findings clarify coal’s fracture mechanics under thermo-anchored coupling, supporting roadway bolting design.</p>

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Mechanical Properties and Damage Constitutive Model of Coal Subjected to Drying Temperatures and Anchored Conditions Under Impact Loading

  • 期刊论文

  • 发表日期：

    2026年2月26日

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  • Shiqiang Xu,
  • Zizheng Zhang,
  • Weijian Yu,
  • Shuaigang Liu,
  • Xianyang Yu,
  • Qiuhong Wu,
  • Hai Wu

摘要

Deep mining beyond 1000 m exposes anchored roadways to elevated ground pressure and temperature, threatening surrounding rock stability. This study investigated the mechanical behavior and damage characteristics of coal under uniaxial dynamic loading at drying temperatures (20–120 °C) and anchored conditions, focusing on their coupled effects on peak stress, energy conversion, and crack propagation. The results demonstrated that, as drying temperature increases, there was a gradual rise in peak stress for coal specimens, accompanied by substantial reflection energy and progressive development of axial splitting cracks in post-failure stage. When drying temperature exceeded 80 °C, structural damage occurred within coal specimens, leading to secondary crack propagation along with central cracking, which further combined with it. This process significantly shortened the dynamic change duration of specimens while increasing both peak stress and transmitted energy, ultimately reducing bearing capacity. Under anchored conditions, this phenomenon occurred prematurely when drying temperature surpassed 60 °C. By employing Weibull distribution theory and an overstress model, a constitutive model integrating thermal and anchorage influences was developed, clarifying coal’s fracture mechanics under thermo-anchored coupling. Its accuracy was verified with experimental findings. The findings clarify coal’s fracture mechanics under thermo-anchored coupling, supporting roadway bolting design.