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

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

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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.

CoalTrue triaxial SHPB testDynamic mechanical propertiesFailure characteristics

Zhanguo Ma、Pengfei Yan、Shixing Cheng、Peng Gong、Fuzhou Qi、Jianguo Wang

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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

National Key Research and Development Program of ChinaNational Key Research and Development Program of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNatural Science Foundation of Jiangsu Province

2019YFE01185002019YFC190430452104107U22A20598BK20200634

2023

10.1016/j.ijmst.2023.03.002

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
年,卷(期)：2023.33(6)
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