Abstract
In this study, the split Hopkinson pressure bar impact tests, uniaxial cyclic loading and unloading (UCLU) tests on anthracite specimens were conducted. The effects of impact loads with different strain rates and uniaxial cyclic loads with different peak stress levels on physical and mechanical characteristics of coal specimens were studied, and the damage variables of specimens were investigated on the basis of energy dissipation theory. The results show with the increase of the cycle number, the increase rates of the normalized peak axial strain and the normalized peak radial strain both show a trend of rapid growth at first and then slow down. With the increase of strain rate of impact loads and peak stress level of uniaxial cyclic loads, the uniaxial compressive strength of coal specimens decreases. In the UCLU tests, the increase of peak axial strain of coal specimens is less than 10%, while the increase of peak radial strain is more than 12%, and the proportion in peak volumetric strain is more and more prominent.
Article highlights
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1.
The effects of impact and uniaxial cyclic loads on mechanical properties and damage of coal specimens are analyzed.
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2.
The failure characteristics of specimens in the UCS test under impact and cyclic loads are dominated by axial tensile splitting failure.
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3.
The damage of coal specimens is still strengthened under the combined action of impact and cyclic loads at a lower level.
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This work was financially supported by National Natural Science Foundation of China (Grant Nos. 51974295, 51974296).
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All authors contributed to the study conception and design. Conceptualization were performed by HW and YC. Methodology was performed by HP and HB. Data curation was performed by KZ. The first draft of the manuscript was written by HW and YC. All authors have read and agreed to the published version of the manuscript.
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Wu, H., Chen, Y., Pu, H. et al. Mechanical and damage properties of coal specimens considering the impact and cyclic loading. Geomech. Geophys. Geo-energ. Geo-resour. 8, 55 (2022). https://doi.org/10.1007/s40948-022-00366-6
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DOI: https://doi.org/10.1007/s40948-022-00366-6