矿业科学技术学报(英文版)2023，Vol.33Issue(6) ：761-772.DOI:10.1016/j.ijmst.2023.03.002

Experimental study of the dynamic mechanical responses and failure characteristics of coal under true triaxial confinements

Zhanguo Ma Pengfei Yan Shixing Cheng Peng Gong Fuzhou Qi Jianguo Wang
矿业科学技术学报(英文版)2023，Vol.33Issue(6) ：761-772.DOI:10.1016/j.ijmst.2023.03.002
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Experimental study of the dynamic mechanical responses and failure characteristics of coal under true triaxial confinements

Zhanguo Ma 1Pengfei Yan 2Shixing Cheng 2Peng Gong 3Fuzhou Qi 2Jianguo Wang3
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作者信息

  • 1. State Key Laboratory for Geomechanics and Deep Underground Engineering,China University of Mining and Technology,Xuzhou 221116,China;School of Mechanics and Civil Engineering,China University of Mining and Technology,Xuzhou 221116,China
  • 2. State Key Laboratory for Geomechanics and Deep Underground Engineering,China University of Mining and Technology,Xuzhou 221116,China
  • 3. School of Mechanics and Civil Engineering,China University of Mining and Technology,Xuzhou 221116,China
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Abstract

Investigations on the dynamic mechanical properties and failure mechanisms of coal under in-situ stress is essential for the prevention of dynamic disasters in deep coal mines.Thus,a modified true triaxial Hopkinson bar was employed to explore the dynamic mechanical behaviors of coal at different confining pressures(0-20 MPa)and strain rates(40-220 s-1).The results show that the dynamic peak stress is pos-itively correlated with lateral static pre-stress σy and σz,but negatively correlated with axial static pre-stress σx.At approximate strain rates,increasing the lateral static pre-stress facilitates increasing the dynamic peak stress,but the minimum lateral static pre-stress is the primary factor limiting a significant increase in dynamic peak stress of coal.Furthermore,the dynamic differential stress is linearly related to the logarithm of strain rate,and the peak strain varies linearly with strain rate.However,there is no sig-nificant correlation between confining pressure and peak strain.Moreover,X-ray CT images and photo-graphic fracture observations of coal samples show the failure patterns under uniaxial and triaxial conditions are splitting failure and shear failure,respectively.The device provides a viable approach for fully comprehending the dynamic mechanical behaviors of rock-like material in complex stress conditions.

Key words

Coal/True triaxial SHPB test/Dynamic mechanical properties/Failure characteristics

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基金项目

National Key Research and Development Program of China(2019YFE0118500)

National Key Research and Development Program of China(2019YFC1904304)

National Natural Science Foundation of China(52104107)

National Natural Science Foundation of China(U22A20598)

Natural Science Foundation of Jiangsu Province(BK20200634)

出版年

2023
矿业科学技术学报(英文版)
中国矿业大学

矿业科学技术学报(英文版)

CSTPCDCSCD北大核心EI
影响因子：1.222
ISSN：2095-2686
参考文献量4
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