An improved strain-softening constitutive model of granite considering the effect of crack deformation
This paper presents an improved strain-softening constitutive model considering the effect of crack deformation based on the triaxial cyclic loading and unloading test results. The improved model assumes that total strain is a combination of plastic, elastic, and crack strains. The constitutive rela...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2024-04-01
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| Series: | Journal of Rock Mechanics and Geotechnical Engineering |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S1674775524000064 |
| _version_ | 1797203013007310848 |
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| author | Yapeng Li Qiang Zhang Qiuxin Gu Peinan Wu Binsong Jiang |
| author_facet | Yapeng Li Qiang Zhang Qiuxin Gu Peinan Wu Binsong Jiang |
| author_sort | Yapeng Li |
| collection | DOAJ |
| description | This paper presents an improved strain-softening constitutive model considering the effect of crack deformation based on the triaxial cyclic loading and unloading test results. The improved model assumes that total strain is a combination of plastic, elastic, and crack strains. The constitutive relationship between the crack strain and the stress was further derived. The evolutions of mechanical parameters, i.e. strength parameters, dilation angle, unloading elastic modulus, and deformation parameters of crack, with the plastic strain and confining pressure were studied. With the increase in plastic strain, the cohesion, friction angle, dilation angle, and crack Poisson's ratio initially increase and subsequently decrease, and the unloading elastic modulus and the crack elastic modulus nonlinearly decrease. The increasing confining pressure enhances the strength and unloading elastic modulus, and decreases the dilation angle and Poisson's ratio of the crack. The theoretical triaxial compressive stress-strain curves were compared with the experimental results, and they present a good agreement with each other. The improved constitutive model can well reflect the nonlinear mechanical behavior of granite. |
| first_indexed | 2024-04-24T08:12:34Z |
| format | Article |
| id | doaj.art-2bf97e15e91a4224a66c23f9eadfb0c9 |
| institution | Directory Open Access Journal |
| issn | 1674-7755 |
| language | English |
| last_indexed | 2024-04-24T08:12:34Z |
| publishDate | 2024-04-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Rock Mechanics and Geotechnical Engineering |
| spelling | doaj.art-2bf97e15e91a4224a66c23f9eadfb0c92024-04-17T04:49:01ZengElsevierJournal of Rock Mechanics and Geotechnical Engineering1674-77552024-04-0116412021215An improved strain-softening constitutive model of granite considering the effect of crack deformationYapeng Li0Qiang Zhang1Qiuxin Gu2Peinan Wu3Binsong Jiang4State Key Laboratory for Geomechanics and Deep Underground Engineering, School of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou, 221116, ChinaCorresponding author.; State Key Laboratory for Geomechanics and Deep Underground Engineering, School of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou, 221116, ChinaState Key Laboratory for Geomechanics and Deep Underground Engineering, School of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou, 221116, ChinaState Key Laboratory for Geomechanics and Deep Underground Engineering, School of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou, 221116, ChinaState Key Laboratory for Geomechanics and Deep Underground Engineering, School of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou, 221116, ChinaThis paper presents an improved strain-softening constitutive model considering the effect of crack deformation based on the triaxial cyclic loading and unloading test results. The improved model assumes that total strain is a combination of plastic, elastic, and crack strains. The constitutive relationship between the crack strain and the stress was further derived. The evolutions of mechanical parameters, i.e. strength parameters, dilation angle, unloading elastic modulus, and deformation parameters of crack, with the plastic strain and confining pressure were studied. With the increase in plastic strain, the cohesion, friction angle, dilation angle, and crack Poisson's ratio initially increase and subsequently decrease, and the unloading elastic modulus and the crack elastic modulus nonlinearly decrease. The increasing confining pressure enhances the strength and unloading elastic modulus, and decreases the dilation angle and Poisson's ratio of the crack. The theoretical triaxial compressive stress-strain curves were compared with the experimental results, and they present a good agreement with each other. The improved constitutive model can well reflect the nonlinear mechanical behavior of granite.http://www.sciencedirect.com/science/article/pii/S1674775524000064Strain-softeningCrack deformation effectPlastic shear strainConstitutive model |
| spellingShingle | Yapeng Li Qiang Zhang Qiuxin Gu Peinan Wu Binsong Jiang An improved strain-softening constitutive model of granite considering the effect of crack deformation Journal of Rock Mechanics and Geotechnical Engineering Strain-softening Crack deformation effect Plastic shear strain Constitutive model |
| title | An improved strain-softening constitutive model of granite considering the effect of crack deformation |
| title_full | An improved strain-softening constitutive model of granite considering the effect of crack deformation |
| title_fullStr | An improved strain-softening constitutive model of granite considering the effect of crack deformation |
| title_full_unstemmed | An improved strain-softening constitutive model of granite considering the effect of crack deformation |
| title_short | An improved strain-softening constitutive model of granite considering the effect of crack deformation |
| title_sort | improved strain softening constitutive model of granite considering the effect of crack deformation |
| topic | Strain-softening Crack deformation effect Plastic shear strain Constitutive model |
| url | http://www.sciencedirect.com/science/article/pii/S1674775524000064 |
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