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Effects of thermal treatment on physical and mechanical characteristics of coal rock

  • Geological, Civil, Energy and Traffic Engineering
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Abstract

To study the physical and mechanical properties of coal rock after treatment at different temperatures under impact loading, dynamic compression experiments were conducted by using a split Hopkinson pressure bar (SHPB). The stress–strain curves of specimens under impact loading were obtained, and then four indexes affected by temperature were analyzed in the experiment: the longitudinal wave velocity, elastic modulus, peak stress and peak strain. Among these indexes, the elastic modulus was utilized to express the specimens’ damage characteristics. The results show that the stress–strain curves under impact loading lack the stage of micro-fissure closure and the slope of the elastic deformation stage is higher than that under static loading. Due to the dynamic loading effect, the peak stress increases while peak strain decreases. The dynamic mechanical properties of coal rock show obvious temperature effects. The longitudinal wave velocity, elastic modulus and peak stress all decrease to different extents with increasing temperature, while the peak strain increases continuously. During the whole heating process, the thermal damage value continues to increase linearly, which indicates that the internal structure of coal rock is gradually damaged by high temperature.

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Authors and Affiliations

  1. School of Resources and Safety Engineering, Central South University, Changsha, 410083, China

    Tu-bing Yin  (尹土兵), Pin Wang  (王品), Xi-bing Li  (李夕兵) & Rong-hua Shu  (舒荣华)

  2. School of Energy and Safety Engineering, Hunan University of Science and Technology, Xiangtan, 411201, China

    Zhou-yuan Ye  (叶洲元)

Authors
  1. Tu-bing Yin  (尹土兵)
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  2. Pin Wang  (王品)
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  3. Xi-bing Li  (李夕兵)
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  4. Rong-hua Shu  (舒荣华)
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  5. Zhou-yuan Ye  (叶洲元)
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Corresponding author

Correspondence to Tu-bing Yin  (尹土兵).

Additional information

Foundation item: Projects(41272304, 51304241, 51204068) supported by the National Natural Science Foundation of China; Project(2014M552164) supported by the Postdoctoral Science Foundation of China; Project(20130162120015) supported by the PhD Programs Foundation of Ministry of Education of China

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Yin, Tb., Wang, P., Li, Xb. et al. Effects of thermal treatment on physical and mechanical characteristics of coal rock. J. Cent. South Univ. 23, 2336–2345 (2016). https://doi.org/10.1007/s11771-016-3292-9

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  • DOI: https://doi.org/10.1007/s11771-016-3292-9

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