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<p>Microwave pretreatment is an effective method for weakening rocks in mining and civil engineering applications. Understanding the dynamic fracturing behavior of microwave-treated rocks is crucial for optimizing microwave-assisted mechanical rock breakage in excavation. In this study, granite disc samples were subjected to microwave irradiation for durations ranging from 0 to 10&#xa0;min, followed by dynamic splitting tensile tests using the Split Hopkinson Pressure Bar (SHPB) apparatus. Rock surface temperatures were measured using an infrared camera, and internal damage was evaluated through nuclear magnetic resonance (NMR). The results demonstrated that microwave treatment significantly reduced the dynamic splitting tensile strength of granite. The increase in porosity was negatively correlated with the macroscopic strength of the rock. Interestingly, some samples without visible macro-cracks exhibited more extensive internal damage than those with visible cracks. High-speed imaging revealed that, as the microwave irradiation time increased, the rock’s impact fracturing behavior transitioned from being primarily controlled by microwave-induced cracks. Based on these findings, a novel microwave-assisted rockburst prevention and control method is proposed.</p>

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Influence of microwave irradiation time on dynamic fracturing behavior and strength reduction in granite

  • 期刊论文

  • 发表日期：

    2025年10月15日

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  • Chun Yang,
  • Yujie Wang,
  • Ferri Hassani,
  • Keping Zhou,
  • Feng Gao,
  • Rugao Gao,
  • Shitong Zhou

摘要

Microwave pretreatment is an effective method for weakening rocks in mining and civil engineering applications. Understanding the dynamic fracturing behavior of microwave-treated rocks is crucial for optimizing microwave-assisted mechanical rock breakage in excavation. In this study, granite disc samples were subjected to microwave irradiation for durations ranging from 0 to 10 min, followed by dynamic splitting tensile tests using the Split Hopkinson Pressure Bar (SHPB) apparatus. Rock surface temperatures were measured using an infrared camera, and internal damage was evaluated through nuclear magnetic resonance (NMR). The results demonstrated that microwave treatment significantly reduced the dynamic splitting tensile strength of granite. The increase in porosity was negatively correlated with the macroscopic strength of the rock. Interestingly, some samples without visible macro-cracks exhibited more extensive internal damage than those with visible cracks. High-speed imaging revealed that, as the microwave irradiation time increased, the rock’s impact fracturing behavior transitioned from being primarily controlled by microwave-induced cracks. Based on these findings, a novel microwave-assisted rockburst prevention and control method is proposed.