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<p>Microwave irradiation, as a novel rock breakage assistance technique, has shown significant potential in underground rock engineering. This study proposes a numerical method combining COMSOL and peridynamics (PD) to investigate the spatiotemporal coupling of the electromagnetic, temperature, mechanical fields, and damage evolution of rock under microwave irradiation. This method’s validity is confirmed by comparing simulation results with experiments. The results show that electromagnetic wave reflection and superposition within the cavity cause uneven electromagnetic field distribution in the rock, leading to localized high temperatures (“hot spots”) and stress concentration. Damage initiates in the hotspot below the borehole and expands over time. The <i>m</i> value, representing the interaction range between material points, shows that smaller <i>m</i> values cause more lateral damage expansion, while larger <i>m</i> values reduce overall damage extent, highlighting the significant effect of horizon radius on damage patterns and expansion paths. Compared to previous methods, the PD method more accurately and flexibly captures the details and evolution of rock damage, demonstrating great potential for studying rock damage mechanisms under multi-physics coupling conditions.</p>

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Electromagnetic–Thermal–Mechanical–Damage Coupling Simulation of Rock Under Microwave Irradiation Based on the COMSOL–Peridynamics Method

  • 期刊论文

  • 发表日期：

    2025年6月16日

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  • Luming Zhou,
  • Zhihong Zhao,
  • Zhibo Duan,
  • Jun Yang,
  • Yunzhe Jin

摘要

Microwave irradiation, as a novel rock breakage assistance technique, has shown significant potential in underground rock engineering. This study proposes a numerical method combining COMSOL and peridynamics (PD) to investigate the spatiotemporal coupling of the electromagnetic, temperature, mechanical fields, and damage evolution of rock under microwave irradiation. This method’s validity is confirmed by comparing simulation results with experiments. The results show that electromagnetic wave reflection and superposition within the cavity cause uneven electromagnetic field distribution in the rock, leading to localized high temperatures (“hot spots”) and stress concentration. Damage initiates in the hotspot below the borehole and expands over time. The m value, representing the interaction range between material points, shows that smaller m values cause more lateral damage expansion, while larger m values reduce overall damage extent, highlighting the significant effect of horizon radius on damage patterns and expansion paths. Compared to previous methods, the PD method more accurately and flexibly captures the details and evolution of rock damage, demonstrating great potential for studying rock damage mechanisms under multi-physics coupling conditions.