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Volume 13
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10.3390/app13020892
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Article

Numerical Investigation into the Mechanical Behaviours and Energy Characteristics of Hard Coal Subjected to Coupled Static-Dynamic Loads

by
Jiachuan Sun
1,2,
Linming Dou
1,
Guifeng Wang
1,
Lihai Tan
1,3,4,* and
Huaide Peng
4
1
School of Mines, China University of Mining and Technology, Xuzhou 221116, China
2
Junde Coal Mine, Longmei Mining Co., Ltd., Hegang 154100, China
3
School of Civil, Mining and Environmental Engineering, University of Wollongong, Wollongong, NSW 2522, Australia
4
School of Resource Environment and Safety Engineering, University of South China, Hengyang 412001, China
*
Author to whom correspondence should be addressed.
Appl. Sci. 2023, 13(2), 892; https://doi.org/10.3390/app13020892
Submission received: 20 December 2022 / Revised: 6 January 2023 / Accepted: 6 January 2023 / Published: 9 January 2023
(This article belongs to the Special Issue Advances in Failure Behavior of Rocks)
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Abstract

In practical engineering, coal burst is usually caused by the combination of high geo-stress and dynamic loading. To study the dynamic response of coal in geo-stress conditions, numerical models of a coupled static–dynamic split Hopkinson pressure bar (SHPB) test system were established, based on which impact tests for coal specimens at different impact speeds and static pre-stress levels were conducted. The mechanical properties, energy characteristics and failure patterns of coal specimens under coupled static and dynamic loads were analyzed. The results show that when the pre-stress is constant, peak stress, the maximum strain energy and the maximum kinetic energy increase significantly with impact speed. Nevertheless, they are less affected by the static pre-stress, increasing linearly with a pre-stress level under lower impact speeds but becoming stable under higher impact speeds. In addition, weak dynamic loads may trigger the instability of the coal specimen in a high pre-stress condition. Overall, both the impact speed and static pre-stress have influence on the mechanical behavior and energy characteristics of coal specimens under coupled static and dynamic loads, but the influence of the impact speed outweighs that of the static pre-stress.
Keywords: numerical modeling; coupled static and dynamic loads; coal burst; energy evolution numerical modeling; coupled static and dynamic loads; coal burst; energy evolution

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MDPI and ACS Style

Sun, J.; Dou, L.; Wang, G.; Tan, L.; Peng, H. Numerical Investigation into the Mechanical Behaviours and Energy Characteristics of Hard Coal Subjected to Coupled Static-Dynamic Loads. Appl. Sci. 2023, 13, 892. https://doi.org/10.3390/app13020892

AMA Style

Sun J, Dou L, Wang G, Tan L, Peng H. Numerical Investigation into the Mechanical Behaviours and Energy Characteristics of Hard Coal Subjected to Coupled Static-Dynamic Loads. Applied Sciences. 2023; 13(2):892. https://doi.org/10.3390/app13020892

Chicago/Turabian Style

Sun, Jiachuan, Linming Dou, Guifeng Wang, Lihai Tan, and Huaide Peng. 2023. "Numerical Investigation into the Mechanical Behaviours and Energy Characteristics of Hard Coal Subjected to Coupled Static-Dynamic Loads" Applied Sciences 13, no. 2: 892. https://doi.org/10.3390/app13020892

APA Style

Sun, J., Dou, L., Wang, G., Tan, L., & Peng, H. (2023). Numerical Investigation into the Mechanical Behaviours and Energy Characteristics of Hard Coal Subjected to Coupled Static-Dynamic Loads. Applied Sciences, 13(2), 892. https://doi.org/10.3390/app13020892

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