Dynamic response characteristics and damage constitutive model of coal samples under impact load

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Journal of Vibration and Shock ›› 2024, Vol. 43 ›› Issue (9) : 139-148.

YANG Ke1,2,3, XU Rijie1,2,3, LIU Shuai1,2,4, LIU Wenjie1,2,3, ZHANG Jie1,2,3

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Abstract

In order to study the dynamic response law of deep coal body, the uniaxial impact compression tests with different strain rates were carried out on the coal samples of Xinhu Mine by using the Split Hopkinson Pressure Bar (SHPB) test system. The results show that the dynamic compressive strength of coal samples under impact load has obvious strain rate effect, and the strain hardening phenomenon becomes more obvious with the increase of strain rate. The reflection energy, transmission energy, absorption energy and energy consumption density of coal samples have a linear function relationship with strain rate, and the proportion of energy consumption has an exponential function relationship with strain rate, and all of them maintain a positive correlation. Based on the classical Zhu-Wang-Tang (ZWT) model, Weibull distribution and Drucker-Prager (D-P) criterion, a dynamic statistical damage constitutive model considering the damage and viscosity characteristics of coal samples was established, and the accuracy and universality of the constitutive model were verified. The model can better describe the dynamic mechanical behavior of coal samples, and provide a basic research for the safe mining of deep coal under the influence of dynamic load.

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coal / strain rate / Zhu-Wang-Tang model / dynamic damage constitutive model / split hopkinson pressure bar

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YANG Ke1,2,3, XU Rijie1,2,3, LIU Shuai1,2,4, LIU Wenjie1,2,3, ZHANG Jie1,2,3. Dynamic response characteristics and damage constitutive model of coal samples under impact load[J]. Journal of Vibration and Shock, 2024, 43(9): 139-148

References

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