Creep failure characteristics and damage creep model of red layer soft rock based on Perzyna viscoplastic theory
Abstract Rock creep is essentially a process of damage accumulation. According to the damage evolution of rock under creep conditions, the TAW2000 triaxial test system is used to carry out triaxial creep test on red layer soft rock taken from Yibo Tunnel in Leshan, Sichuan Province, China, and analy...
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Nature Portfolio
2025-04-01
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| Series: | Scientific Reports |
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| Online Access: | https://doi.org/10.1038/s41598-025-96352-5 |
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| author | Lei Chen Jinchi Han Shuguang Zhang Jiaxu Jin Baoxin Jia Jiashun Liu Jupeng Tang |
| author_facet | Lei Chen Jinchi Han Shuguang Zhang Jiaxu Jin Baoxin Jia Jiashun Liu Jupeng Tang |
| author_sort | Lei Chen |
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| description | Abstract Rock creep is essentially a process of damage accumulation. According to the damage evolution of rock under creep conditions, the TAW2000 triaxial test system is used to carry out triaxial creep test on red layer soft rock taken from Yibo Tunnel in Leshan, Sichuan Province, China, and analyzed the creep deformation rule under different confining pressures. Meanwhile, based on the Nishihara model and Weibull distribution function and Perzyna viscoplastic theory, an improved viscoelastic-plastic creep model which can describe the whole process of rock creep failure was established. The critical point damage variable is defined by dividing the creep stage, so that the acceleration creep start time can be determined more accurately. The results show that: (1) The model curves in this paper fit well with the test data, indicating that Weibull distribution function is feasible to describe rock creep damage, and the accuracy and rationality of the model in this paper are verified. (2) Based on Perzyna viscoplastic theory, a more accurate viscoplastic strain expression was established to describe accelerated creep. (3) By defining the critical point damage variables of different creep stages, the relationship between rock creep deformation and damage can be better reflected, which makes up the shortcoming that Nishihara model cannot describe accelerated creep, and enriches the creep constitutive theory of rock materials. |
| format | Article |
| id | doaj-art-0c1afec99ea1463187f7dfc6d20b3d09 |
| institution | DOAJ |
| issn | 2045-2322 |
| language | English |
| publishDate | 2025-04-01 |
| publisher | Nature Portfolio |
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| spelling | doaj-art-0c1afec99ea1463187f7dfc6d20b3d092025-08-20T03:07:41ZengNature PortfolioScientific Reports2045-23222025-04-0115111310.1038/s41598-025-96352-5Creep failure characteristics and damage creep model of red layer soft rock based on Perzyna viscoplastic theoryLei Chen0Jinchi Han1Shuguang Zhang2Jiaxu Jin3Baoxin Jia4Jiashun Liu5Jupeng Tang6Ordos Institute of Liaoning Technical UniversityOrdos Institute of Liaoning Technical UniversityGuangxi Key Laboratory of Geomechanics and Geotechnical EngineeringSchool of Civil Engineering, Liaoning Technical UniversityOrdos Institute of Liaoning Technical UniversitySchool of Civil Engineering, Liaoning Technical UniversitySchool of Civil Engineering, Liaoning Technical UniversityAbstract Rock creep is essentially a process of damage accumulation. According to the damage evolution of rock under creep conditions, the TAW2000 triaxial test system is used to carry out triaxial creep test on red layer soft rock taken from Yibo Tunnel in Leshan, Sichuan Province, China, and analyzed the creep deformation rule under different confining pressures. Meanwhile, based on the Nishihara model and Weibull distribution function and Perzyna viscoplastic theory, an improved viscoelastic-plastic creep model which can describe the whole process of rock creep failure was established. The critical point damage variable is defined by dividing the creep stage, so that the acceleration creep start time can be determined more accurately. The results show that: (1) The model curves in this paper fit well with the test data, indicating that Weibull distribution function is feasible to describe rock creep damage, and the accuracy and rationality of the model in this paper are verified. (2) Based on Perzyna viscoplastic theory, a more accurate viscoplastic strain expression was established to describe accelerated creep. (3) By defining the critical point damage variables of different creep stages, the relationship between rock creep deformation and damage can be better reflected, which makes up the shortcoming that Nishihara model cannot describe accelerated creep, and enriches the creep constitutive theory of rock materials.https://doi.org/10.1038/s41598-025-96352-5Red bed soft rockCreep testWeibull functionPerzyna viscoplastic theoryCritical threshol |
| spellingShingle | Lei Chen Jinchi Han Shuguang Zhang Jiaxu Jin Baoxin Jia Jiashun Liu Jupeng Tang Creep failure characteristics and damage creep model of red layer soft rock based on Perzyna viscoplastic theory Scientific Reports Red bed soft rock Creep test Weibull function Perzyna viscoplastic theory Critical threshol |
| title | Creep failure characteristics and damage creep model of red layer soft rock based on Perzyna viscoplastic theory |
| title_full | Creep failure characteristics and damage creep model of red layer soft rock based on Perzyna viscoplastic theory |
| title_fullStr | Creep failure characteristics and damage creep model of red layer soft rock based on Perzyna viscoplastic theory |
| title_full_unstemmed | Creep failure characteristics and damage creep model of red layer soft rock based on Perzyna viscoplastic theory |
| title_short | Creep failure characteristics and damage creep model of red layer soft rock based on Perzyna viscoplastic theory |
| title_sort | creep failure characteristics and damage creep model of red layer soft rock based on perzyna viscoplastic theory |
| topic | Red bed soft rock Creep test Weibull function Perzyna viscoplastic theory Critical threshol |
| url | https://doi.org/10.1038/s41598-025-96352-5 |
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