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Characteristic Strength and Energy Evolution Law of Coal Treated by Ultrasonic Wave with Different Power Under Uniaxial Compression

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Abstract

Improving fissuring structures of low-permeability coal seams is crucial for enhancing coalbed methane (CBM) recovery. In this study, coal samples were treated with ultrasonic power of 264, 374, 484, 594, and 704 W, and the longitudinal wave velocity and micro-cracks of the coal samples were measured by ultrasonic testing and optical microscope before and after ultrasonic treatment. Moreover, the characteristic strength and final failure states of the samples were obtained during the uniaxial compression test. Furthermore, the intrinsic connection among mechanical properties, energy evolution, and micro-crack development was established and discussed, whereby the mechanism of the cracking coal bodies by ultrasonic excitation was explained. With increase in ultrasonic power, the micro-cracks propagation rate and the P-wave velocity decay rate increased synchronously. The strength and energy of ultrasonic-treated coal samples decreased significantly and the degree of compression failure was higher. Particularly, compared with the untreated specimens, the uniaxial compression strength decreased by 77.7%, and the fractal dimension of the end-state increased by 25.9% when the power was 704 W. The energy stored during the post-peak region of the specimens decreased with ultrasonic power increase; meanwhile, the energy required for macroscopic fracture extension decreased. Correspondingly, characterization parameters of limiting energy storage decreased from 5.1 to 87.8% and dissipation energy conversion rate decreased from 7.2 to 96.3%. Ultimately, ultrasonic power can effectively fracture the coal body, reduce its strength and energy storage capacity, and improve the permeability of the coal seam.

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Acknowledgments

This study was supported by the National Natural Science Foundation of China (Nos. 51734007, 52174207, 51974237, 51904237,) and the Natural Science Foundation of Shaanxi Province, China (No. 2019JLP-02).

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Authors and Affiliations

  1. Xi’an University of Science and Technology, Xi’an, 710054, People’s Republic of China

    Erhao Yang, Haifei Lin, Shugang Li, Pengxiang Zhao, Lei Qin, Ruizhe Wang & Shuangze Han

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  1. Erhao Yang
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  2. Haifei Lin
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  3. Shugang Li
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  4. Pengxiang Zhao
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Correspondence to Haifei Lin or Shugang Li.

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Yang, E., Lin, H., Li, S. et al. Characteristic Strength and Energy Evolution Law of Coal Treated by Ultrasonic Wave with Different Power Under Uniaxial Compression. Nat Resour Res 31, 913–928 (2022). https://doi.org/10.1007/s11053-022-10015-0

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