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Electric Potential Response Characteristics and Constitutive Model of Coal Under Axial Static Load–Dynamic Load Coupling
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Electric Potential Response Characteristics and Constitutive Model of Coal Under Axial Static Load–Dynamic Load Coupling
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Journal Article
Electric Potential Response Characteristics and Constitutive Model of Coal Under Axial Static Load–Dynamic Load Coupling
2023
Overview
The electrical and magnetic signals generated by coal fracture can expose the mechanical properties and fracture behavior of coal, which are of great significance for underground mining engineering safety under high static stress and dynamic load disturbance conditions. This work used the split Hopkinson pressure bar experimental apparatus to perform impact dynamic experiments on coal samples with axial static load–dynamic load coupling and test the electric potential (EP) signal. We studied the characteristics of coal’s EP response under various dynamic and static load coupling conditions, discussed the mechanisms by which different variables affected EP response, and built an EP-based constitutive model of coal damage progression. The results revealed that under the coupling of axial static load–dynamic load, noticeable EP signals are stimulated in coal, and the change in EP signal is well correlated with the change in mechanical behavior. However, increasing dynamic load can excite a greater EP signal, and the peak EP grows linearly with stress. Peak EP first increases linearly as the axial static load increases, and when the axial static load reaches the critical threshold, peak EP and peak stress start to decrease progressively. Peak EP variation well corresponds to peak stress. Crack propagation and free electron escape can explain the effect of axial static load and dynamic load on coal EP signal at the micro level. On this basis, we developed an EP constitutive model of coal damage evolution under axial static load–dynamic load coupling. The model can well calculate the stress state of coal. The study’s findings provide a solid theoretical foundation for security monitoring of deep-underground engineering.
Publisher
Springer US,Springer Nature B.V
