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The effect of gas adsorption on the mechanical behavior and property of coal in uniaxial and triaxial compression

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Abstract

To study the effect of gas adsorption on the mechanical behaviors and properties of coal, the characteristics of coal deformation and fracture under different gas adsorptions and loading conditions are investigated. The results show that the adsorbance of gas in coal increases with the increase of gas pressure and adsorption time, whereas the rise rate of adsorbance decreases gradually when the adsorption is over 5 MPa or when the adsorption time is over 10 h. In uniaxial compression, with the increase of adsorption pressure and time, the elastic modulus and peak strength of coal specimen all decrease, and the failure mode of coal specimen transitions from splitting failure to serious local failure and fragmentation failure. The size of fragment of coal specimen also decreases with the increase of adsorption pressure. In triaxial compression, with the increase of adsorption pressure, the rise rate of the (average) elastic modulus decreases, and has the contrary law of variation with the strength of coal specimen, the failure mode of coal specimen transitions from shear failure to multi shear failure and fragmentation failure. Additionally, with the increase of adsorption pressure, the peak energy of acoustic emission also increases after the peak axial stress, the more adsorption pressure, the more cracks initiate, propagate and coalesce inside coal specimen at the stage of fracture.

Article highlights

  1. 1.

    The deformation and fracture characteristics of adsorbed gas coal are investigated.

  2. 2.

    The increase rate of adsorbance decreases gradually when the adsorption is over 5 MPa or when the adsorption time is over 10 hours.

  3. 3.

    In uniaxial compression, the failure mode transitions from splitting failure to serious local failure and fragmentation failure.

  4. 4.

    In triaxial compression, the failure mode transitions from shear failure to multi shear failure and fragmentation failure.

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Acknowledgements

The work described in this paper was substantially supported by the National Natural Science Foundation of China (No. 51974186, 51974145), Project Supported by Discipline Innovation Team of Liaoning Technical University (LNTU20TD-17) and Liaoning Provincial Education Department Project (LJ2020QNL011), all these sources of support are gratefully acknowledged. Additionally, I would like to thank my girlfriend, Miss Song Jiatong, for her constant company and support for my works, will you marry me?

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Authors and Affiliations

  1. School of Mechanics and Engineering, Liaoning Technical University, Fuxin, 123000, China

    Jun Xu, Xiaochun Xiao & Di Wu

  2. Liaoning Key Laboratory of Mining Environment and Disaster Mechanics, Liaoning Technical University, Fuxin, 123000, China

    Jun Xu, Xiaochun Xiao & Di Wu

  3. School of Civil Engineering, Liaoning Technical University, Fuxin, 123000, China

    Jiaxu Jin

  4. Colledge of Aerospace Engineering, Shenyang Aerospace University, Shenyang, 110121, China

    Cunying Meng

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  1. Jun Xu
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  2. Xiaochun Xiao
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  3. Di Wu
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Correspondence to Xiaochun Xiao or Cunying Meng.

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Xu, J., Xiao, X., Wu, D. et al. The effect of gas adsorption on the mechanical behavior and property of coal in uniaxial and triaxial compression. Geomech. Geophys. Geo-energ. Geo-resour. 8, 56 (2022). https://doi.org/10.1007/s40948-022-00360-y

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