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Microwave-assisted breakage of basalt: A viewpoint on analyzing the thermal and mechanical behavior of rock

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  • Liang, Cun-Guang
  • Guo, Ze-Shi
  • Yue, Xiu
  • Li, Hui
  • Ma, Peng-Cheng

Abstract

Microwave-assisted breakage of rock has gained widespread popularity in the field of mining and geotechnical engineering. However, the breakage mechanism of rock is not clearly explained due to the involvement of complex multiphysics coupling issues. To study the thermal and mechanical behavior of basalt rock under the microwave irradiation, a coupled electromagnetic-thermal-mechanical mathematical model was established to analyze the heating process and explain the breakage mechanism. The results showed that in the energy conversion stage of the electric field, an inhomogeneous electric field distribution was observed in the cavity and basalt rock, which further resulted in the generation of a temperature gradient in the sample due to the dielectric losses of rock. This phenomenon can be demonstrated in the coupled electromagnetic-thermal model. The simulation results indicated that internal compression and external tension are the main causes of the fracture or blast of basalt rock. The experimental failure position of basalt was in line with the generation of the maximum thermal stress and strain in the simulation. The experimental and simulated results demonstrated synergistic stress and strain damage in the breakage process. The outcomes of this study can provide some scientific guidelines for the application of microwave-assisted breakage of rock.

Suggested Citation

  • Liang, Cun-Guang & Guo, Ze-Shi & Yue, Xiu & Li, Hui & Ma, Peng-Cheng, 2023. "Microwave-assisted breakage of basalt: A viewpoint on analyzing the thermal and mechanical behavior of rock," Energy, Elsevier, vol. 273(C).
  • Handle: RePEc:eee:energy:v:273:y:2023:i:c:s0360544223006199
    DOI: 10.1016/j.energy.2023.127225
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    References listed on IDEAS

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    1. He, Jianming & Li, Xiao & Yin, Chao & Zhang, Yixiang & Lin, Chong, 2020. "Propagation and characterization of the micro cracks induced by hydraulic fracturing in shale," Energy, Elsevier, vol. 191(C).
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    3. Fia, A.Z. & Amorim, J., 2021. "Heating of biomass in microwave household oven - A numerical study," Energy, Elsevier, vol. 218(C).
    4. Lan, Wenjian & Wang, Hanxiang & Zhang, Xin & Fan, Hongbo & Feng, Kun & Liu, Yanxin & Sun, Bingyu, 2020. "Investigation on the mechanism of micro-cracks generated by microwave heating in coal and rock," Energy, Elsevier, vol. 206(C).
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    Cited by:

    1. Ma, Zhongjun & Zheng, Yanlong & Li, Jianchun & Zhao, Xiaobao & Zhao, Jian, 2024. "Enhancing rock breakage efficiency by microwave fracturing: A study on antenna selection," Energy, Elsevier, vol. 288(C).
    2. Zhou, Yu & Lv, Wenjun & Zhang, Cheng & Zhou, Zihan & Wang, Hongyu & Liang, Qinyuan & Tang, Qiongqiong & Han, Guansheng & Guo, Wei & Zhao, Dajun, 2024. "Novel hard rock breaking technique using ultra-high-frequency particle impact induced by ultrasonic vibration field," Energy, Elsevier, vol. 288(C).

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