Abstract
Understanding the properties of coal under complex conditions that involve static and dynamic loading, as well as high gas content, is vitally important for the prevention of dynamic coal-rock disasters. In a previous study, a novel apparatus was developed for impact-static coupling tests on gas-bearing coal as well as to visualize the test process. In the present study, this apparatus was employed to examine the mechanical properties and failure characteristics of coal under the above conditions. The test results showed the following. Impact loading produced further crack development in the statically pre-loaded, gas-bearing coal or even directly caused the coal to fail. In addition, impact loading resulted in an increase in the volumetric strain and a decrease in the compressive strength of the coal. The extent to which impact loading affected the coal increased as the gas adsorption content of the coal increased and as the coal approached the ultimate failure under static loading before impact loading was applied. Moreover, a synergistic damage effect was observed when the coal was subjected to a combination of impact loading, static loading, and gas adsorption. This study provides guidance for preventing dynamic coal-rock disasters under complex conditions.
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The datasets used or analyzed during the current study are available from the corresponding author on reasonable request.
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This research was funded by the National Natural Science Foundation of China (52174081, 51808359), Natural Science Foundation of Shandong Province (2019GSF111036).
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Bing Zhang: methodology, formal analysis, investigation, writing—original draft, writing—review and editing. Hanpeng Wang: conceptualization, resources, project administration, funding acquisition. Peng Wang: investigation, data curation. Fei Xu: supervision, funding acquisition. Xinping Yu: visualization.
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Responsible Editor: Zeynal Abiddin Erguler
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Zhang, B., Wang, H., Wang, P. et al. Mechanical properties and failure characteristics of gas-bearing coal under static pre-load and impact load. Arab J Geosci 14, 2250 (2021). https://doi.org/10.1007/s12517-021-08621-y
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DOI: https://doi.org/10.1007/s12517-021-08621-y