Creep characteristics and damage model of coal–rock combinations with different height ratios
Abstract Numerous coal pillars are left after the coal mining process. The composite structure comprising a roof and coal pillar has prominent creep characteristics, which threaten safe underground mining. Therefore, the creep characteristics of coal-rock combinations should be studied to ensure the...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Nature Portfolio
2023-12-01
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| Series: | Scientific Reports |
| Online Access: | https://doi.org/10.1038/s41598-023-49841-4 |
| _version_ | 1827394625651867648 |
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| author | Junguang Wang Song Yang Yanming Qi Yiran Cong |
| author_facet | Junguang Wang Song Yang Yanming Qi Yiran Cong |
| author_sort | Junguang Wang |
| collection | DOAJ |
| description | Abstract Numerous coal pillars are left after the coal mining process. The composite structure comprising a roof and coal pillar has prominent creep characteristics, which threaten safe underground mining. Therefore, the creep characteristics of coal-rock combinations should be studied to ensure the safety of quarry and surface. Uniaxial creep tests under static load axial pressure and different height ratios were performed using a self-designed rock creep disturbance test device to determine the effect of height ratio and axial pressure on the creep characteristics of coal–rock combinations. From the test results, a creep damage model for coal–rock combinations was established by combining the elastomer, fractional Kelvin body, plastic body, Abel dashpot, and modified nonlinear viscoplastic body; introducing damage variables D related to stress, height ratio, and time; and deriving a one-dimensional creep equation. An improved nonlinear least squares method based on pattern search was utilized to invert the creep parameters. The results of the creep equation calculation were fitted with the experimental results with good results. The creep curve with a height ratio of 2:1 was predicted with good results. The research results provide theoretical references for long-term stability analysis of rock engineering. |
| first_indexed | 2024-03-08T18:15:35Z |
| format | Article |
| id | doaj.art-726c2617e4364406abc07b8679cdff60 |
| institution | Directory Open Access Journal |
| issn | 2045-2322 |
| language | English |
| last_indexed | 2024-03-08T18:15:35Z |
| publishDate | 2023-12-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Scientific Reports |
| spelling | doaj.art-726c2617e4364406abc07b8679cdff602023-12-31T12:10:21ZengNature PortfolioScientific Reports2045-23222023-12-0113111710.1038/s41598-023-49841-4Creep characteristics and damage model of coal–rock combinations with different height ratiosJunguang Wang0Song Yang1Yanming Qi2Yiran Cong3School of Mechanics and Engineering, Liaoning Technical UniversitySchool of Mechanics and Engineering, Liaoning Technical UniversityLiaoning Province Nonferrous Geology 101 Team Co. LtdQingdao Feiyang Human Resources Development Co. LtdAbstract Numerous coal pillars are left after the coal mining process. The composite structure comprising a roof and coal pillar has prominent creep characteristics, which threaten safe underground mining. Therefore, the creep characteristics of coal-rock combinations should be studied to ensure the safety of quarry and surface. Uniaxial creep tests under static load axial pressure and different height ratios were performed using a self-designed rock creep disturbance test device to determine the effect of height ratio and axial pressure on the creep characteristics of coal–rock combinations. From the test results, a creep damage model for coal–rock combinations was established by combining the elastomer, fractional Kelvin body, plastic body, Abel dashpot, and modified nonlinear viscoplastic body; introducing damage variables D related to stress, height ratio, and time; and deriving a one-dimensional creep equation. An improved nonlinear least squares method based on pattern search was utilized to invert the creep parameters. The results of the creep equation calculation were fitted with the experimental results with good results. The creep curve with a height ratio of 2:1 was predicted with good results. The research results provide theoretical references for long-term stability analysis of rock engineering.https://doi.org/10.1038/s41598-023-49841-4 |
| spellingShingle | Junguang Wang Song Yang Yanming Qi Yiran Cong Creep characteristics and damage model of coal–rock combinations with different height ratios Scientific Reports |
| title | Creep characteristics and damage model of coal–rock combinations with different height ratios |
| title_full | Creep characteristics and damage model of coal–rock combinations with different height ratios |
| title_fullStr | Creep characteristics and damage model of coal–rock combinations with different height ratios |
| title_full_unstemmed | Creep characteristics and damage model of coal–rock combinations with different height ratios |
| title_short | Creep characteristics and damage model of coal–rock combinations with different height ratios |
| title_sort | creep characteristics and damage model of coal rock combinations with different height ratios |
| url | https://doi.org/10.1038/s41598-023-49841-4 |
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