Shear creep mechanical properties and damage model of mudstone in open-pit coal mine
Abstract Clarifying the shear creep characteristics of rock and scientifically analyzing its creep deformation law is the key to solving the problem of safe construction and long-term stability analysis of the open-pit coal slope rock mass. Shear creep tests were carried out on mudstone from an open...
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| Format: | Article |
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Nature Portfolio
2022-03-01
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| Series: | Scientific Reports |
| Online Access: | https://doi.org/10.1038/s41598-022-08488-3 |
| _version_ | 1811332097455947776 |
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| author | Guanghe Li Yanting Wang Yiming Hu Dong Wang Xiaoxu Yang Yanfei Li Zhiwei Zhou Shipeng Zhang |
| author_facet | Guanghe Li Yanting Wang Yiming Hu Dong Wang Xiaoxu Yang Yanfei Li Zhiwei Zhou Shipeng Zhang |
| author_sort | Guanghe Li |
| collection | DOAJ |
| description | Abstract Clarifying the shear creep characteristics of rock and scientifically analyzing its creep deformation law is the key to solving the problem of safe construction and long-term stability analysis of the open-pit coal slope rock mass. Shear creep tests were carried out on mudstone from an open-pit coal mine in Eastern Mongolia to reveal the creep characteristics of mudstone under different normal and shear stresses. Based on the classical Nishihara model, a new composite six-element nonlinear shear creep damage model is established by introducing nonlinear elastomers. Using the least square method, model verification and parameter identification are carried out on the variable test data. At the same time, the influence law of the model parameters on the rock creep deformation is analyzed according to the theoretical curve. The study results showed that the nonlinear shear creeps damage model could better describe the creep characteristics of rock different normal stress and shear stress levels, significantly the non-linear both the strain and time of attenuation creep and accelerated creep. The creep characteristics of the accelerated creep stage described by this model are better than those described by the classical Nishihara model. The model curve is consistent with the changing trend of the experimental data, and the degree of agreement is very high. The correlation coefficients are all above 0.98, which verifies the accuracy and rationality of the model. The influence law of creep parameters is analyzed. The parameters b and c increase nonlinearly with creep. The increase of λ accelerates the process of rock attenuation creep stage; the increase of η 10 slows down the progress of rock decay creep stage; with the increase of α, the deformation and creep rate of rock in accelerated creep stage gradually increase. When η 2 increases, the deformation in the acceleration stage decreases gradually. The research results can provide important theoretical support for the safe construction and long-term stability analysis of open-pit coal slope rock masses. |
| first_indexed | 2024-04-13T16:31:35Z |
| format | Article |
| id | doaj.art-abe5138bc5c54e47905ccbaedd778cae |
| institution | Directory Open Access Journal |
| issn | 2045-2322 |
| language | English |
| last_indexed | 2024-04-13T16:31:35Z |
| publishDate | 2022-03-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Scientific Reports |
| spelling | doaj.art-abe5138bc5c54e47905ccbaedd778cae2022-12-22T02:39:33ZengNature PortfolioScientific Reports2045-23222022-03-0112111210.1038/s41598-022-08488-3Shear creep mechanical properties and damage model of mudstone in open-pit coal mineGuanghe Li0Yanting Wang1Yiming Hu2Dong Wang3Xiaoxu Yang4Yanfei Li5Zhiwei Zhou6Shipeng Zhang7College of Mining, Liaoning Technical UniversityCollege of Mining, Liaoning Technical UniversityCollege of Mining, Liaoning Technical UniversityCollege of Mining, Liaoning Technical UniversityCollege of Mining, Liaoning Technical UniversityShenhua Bor Xil Energy Co.Ltd.Shenhua Bor Xil Energy Co.Ltd.College of Mining, Liaoning Technical UniversityAbstract Clarifying the shear creep characteristics of rock and scientifically analyzing its creep deformation law is the key to solving the problem of safe construction and long-term stability analysis of the open-pit coal slope rock mass. Shear creep tests were carried out on mudstone from an open-pit coal mine in Eastern Mongolia to reveal the creep characteristics of mudstone under different normal and shear stresses. Based on the classical Nishihara model, a new composite six-element nonlinear shear creep damage model is established by introducing nonlinear elastomers. Using the least square method, model verification and parameter identification are carried out on the variable test data. At the same time, the influence law of the model parameters on the rock creep deformation is analyzed according to the theoretical curve. The study results showed that the nonlinear shear creeps damage model could better describe the creep characteristics of rock different normal stress and shear stress levels, significantly the non-linear both the strain and time of attenuation creep and accelerated creep. The creep characteristics of the accelerated creep stage described by this model are better than those described by the classical Nishihara model. The model curve is consistent with the changing trend of the experimental data, and the degree of agreement is very high. The correlation coefficients are all above 0.98, which verifies the accuracy and rationality of the model. The influence law of creep parameters is analyzed. The parameters b and c increase nonlinearly with creep. The increase of λ accelerates the process of rock attenuation creep stage; the increase of η 10 slows down the progress of rock decay creep stage; with the increase of α, the deformation and creep rate of rock in accelerated creep stage gradually increase. When η 2 increases, the deformation in the acceleration stage decreases gradually. The research results can provide important theoretical support for the safe construction and long-term stability analysis of open-pit coal slope rock masses.https://doi.org/10.1038/s41598-022-08488-3 |
| spellingShingle | Guanghe Li Yanting Wang Yiming Hu Dong Wang Xiaoxu Yang Yanfei Li Zhiwei Zhou Shipeng Zhang Shear creep mechanical properties and damage model of mudstone in open-pit coal mine Scientific Reports |
| title | Shear creep mechanical properties and damage model of mudstone in open-pit coal mine |
| title_full | Shear creep mechanical properties and damage model of mudstone in open-pit coal mine |
| title_fullStr | Shear creep mechanical properties and damage model of mudstone in open-pit coal mine |
| title_full_unstemmed | Shear creep mechanical properties and damage model of mudstone in open-pit coal mine |
| title_short | Shear creep mechanical properties and damage model of mudstone in open-pit coal mine |
| title_sort | shear creep mechanical properties and damage model of mudstone in open pit coal mine |
| url | https://doi.org/10.1038/s41598-022-08488-3 |
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