Study on the energy evolution characteristics of coal-rock combined bodies under uniaxial compression
To reveal the energy evolution characteristics of coal-rock combined bodies at different coal-body heights, uniaxial compression tests were conducted to investigate the influence of the coal-body height on the energy evolution features during the compression and failure process of the combined bodie...
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| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2025-06-01
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| Series: | Results in Engineering |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2590123025014318 |
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| Summary: | To reveal the energy evolution characteristics of coal-rock combined bodies at different coal-body heights, uniaxial compression tests were conducted to investigate the influence of the coal-body height on the energy evolution features during the compression and failure process of the combined bodies. The results show that the height of the coal body strongly influences the input of total energy, the accumulation of elastic strain energy, and the processes of energy dissipation and release. For the RCR combined bodies, the total input energy decreases with increasing coal height. The total input energy for the RCR-20 sample was 0.286 MJ·m⁻³, whereas for the RCR-60 sample, it decreased to 0.198 MJ·m⁻³. When the proportion of coal is the same, the total input energy of the RCR combined body is greater than that of the RC combined body. When the coal height remains constant, the maximum elastic strain energy in the RCR combined body is greater than that in the RC combined body. For the RCR combined bodies, the energy accumulation capacity of coal increases with height, whereas the energy proportion of sand rock decreases rapidly. When the coal height was 20 mm, the coal layer contributed approximately 50.18 % of the pre-peak total input energy of the combined bodies, whereas the sand rock layers accounted for 49.82 %. When the coal height increased to 60 mm, the contribution of the coal layer increased to 82.14 %, whereas the proportion of sandstone decreased to 17.86 %. As the coal height increases, the maximum coefficient of energy dissipation of the combined bodies decreases. The energy dissipation coefficient (λ) decreases from 6.92 for RCR-20 to 3.51 for RCR-40, and then further decreases to 2.24 for RCR-60. Additionally, the variation rate of the energy dissipation coefficient during the plastic stage of the RCR combined bodies gradually increases with increasing coal height. This study investigated the influence of coal body height on the energy evolution process of coal-rock combined bodies under uniaxial compression. The results may provide a theoretical basis for preventing coal mine dynamic disasters and improving mining efficiency. |
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| ISSN: | 2590-1230 |