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Experimental study of strength characteristics of coal specimens after water intrusion

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Abstract

We carried out uniaxial compressive experiments on coal specimens with different moisture contents to gain a better understanding of the water-induced weakening characteristics of coal. The effects of moisture content on the strength and deformation characteristics of the specimens were analyzed. The results of the uniaxial compressive experiment demonstrate that the full stress–strain curve presents plastic deformation characteristics with the increase of the moisture content in the coal specimens. A positive linear relation between the peak strain and moisture content and a negative one between the compressive strength and moisture content were observed. The results also show that the elastic modulus and the moisture content satisfy a negative exponential function. Taking the obtained relation as boundary conditions and applying the statistical damage theory and strain equivalence hypothesis, we derived a statistical constitutive damage model for coal which can reflect the effects of the moisture content.

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Acknowledgments

The financial support for this work, provided by “the Fundamental Research Funds for the Central Universities” (2014QNB31), is gratefully acknowledged.

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Authors and Affiliations

  1. School of Mines, China University of Mining and Technology, Xuzhou, 221008, China

    Qiangling Yao, Xuehua Li, Jian Zhou, Minghe Ju & Zhaohui Chong

  2. Key Laboratory of Deep Coal Resource Mining (CUMT), Ministry of Education, Xuzhou, 221008, China

    Qiangling Yao, Xuehua Li, Jian Zhou, Minghe Ju & Zhaohui Chong

  3. Huainan Mining Industry Group, Huainan, 232001, China

    Bin Zhao

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  1. Qiangling Yao
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  2. Xuehua Li
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  3. Jian Zhou
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  4. Minghe Ju
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  5. Zhaohui Chong
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  6. Bin Zhao
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Correspondence to Xuehua Li.

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Yao, Q., Li, X., Zhou, J. et al. Experimental study of strength characteristics of coal specimens after water intrusion. Arab J Geosci 8, 6779–6789 (2015). https://doi.org/10.1007/s12517-014-1764-5

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  • DOI: https://doi.org/10.1007/s12517-014-1764-5

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