Geomechanics and Engineering

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Dynamic response of coal and rocks under high strain rate

  • Zhou, Jingxuan (Faculty of Safety Engineering, China University of Mining and Technology) ;
  • Zhu, Chuanjie (Faculty of Safety Engineering, China University of Mining and Technology) ;
  • Ren, Jie (Faculty of Safety Engineering, China University of Mining and Technology) ;
  • Lu, Ximiao (Faculty of Safety Engineering, China University of Mining and Technology) ;
  • Ma, Cong (Faculty of Safety Engineering, China University of Mining and Technology) ;
  • Li, Ziye (Faculty of Safety Engineering, China University of Mining and Technology)
  • Received : 2020.04.05
  • Accepted : 2022.04.03
  • Published : 2022.05.25
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Abstract

The roadways surrounded by rock and coal will lose their stability or even collapse under rock burst. Rock burst mainly involves an evolution of dynamic loading which behaves quite differently from static or quasi-static loading. To compare the dynamic response of coal and rocks with different static strengths, three different rocks and bituminous coal were selected for testing at three different dynamic loadings. It's found that the dynamic compression strength of rocks and bituminous coal is much greater than the static compression strength. The dynamic compression strength and dynamic increase factor of the rocks both increase linearly with the increase of the strain rate, while those of the bituminous coal are irregular due to the characteristics of multi-fracture and heterogeneity. Moreover, the absorbed energy of the rocks and bituminous coal both increase linearly with an increase in the strain rate. And the ratio of absorbed energy to the total energy of bituminous coal is greater than that of rocks. With the increase of dynamic loading, the failure degree of the sample increases, with the increase of the static compressive strength, the damage degree also increases. The static compassion strength of the bituminous coal is lower than that of rocks, so the number of small-scale fragments was the largest after bituminous coal rupture.

Keywords

Acknowledgement

Financial support provided by the National Natural Science Foundation of China (NSFC) (Grant Number: 51874293) and National Science and Technology Major Project (Grant Number: 2020YFA0711803) for this research is gratefully acknowledged.

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