Deformation and failure characteristics of sandstone subjected to true‐triaxial unloading: An experimental and numerical study
In this research, we conducted both laboratory experiments and discrete element simulations to investigate the influence of maximum principal stress level on true‐triaxial unloading behaviors of sandstone samples. The results show that as the level of σ1 at the unloading point increases, the ultimat...
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| Published in | Fatigue & fracture of engineering materials & structures Vol. 44; no. 7; pp. 1862 - 1882 |
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| Main Authors | , , , , , |
| Format | Journal Article |
| Language | English |
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Oxford
Wiley Subscription Services, Inc
01.07.2021
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| Abstract | In this research, we conducted both laboratory experiments and discrete element simulations to investigate the influence of maximum principal stress level on true‐triaxial unloading behaviors of sandstone samples. The results show that as the level of σ1 at the unloading point increases, the ultimate bearing capacity of sandstone sample is increasingly strengthened, while the sample collapses more easily during the unloading process, and the failure mode of sample changes from mixed tensile‐shear failure to shear failure. With the increase in the level of σ1, the accumulative micro‐cracks at the unloading point and micro‐crack generation rate during the unloading phase exhibit increasing trends, while the ratio between the number of tensile micro‐cracks and shear micro‐cracks generally shows a downward trend. The formation of macro fracture in sandstone sample is closely related to the material inhomogeneity and true‐triaxial stress state. |
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| AbstractList | In this research, we conducted both laboratory experiments and discrete element simulations to investigate the influence of maximum principal stress level on true‐triaxial unloading behaviors of sandstone samples. The results show that as the level of σ1 at the unloading point increases, the ultimate bearing capacity of sandstone sample is increasingly strengthened, while the sample collapses more easily during the unloading process, and the failure mode of sample changes from mixed tensile‐shear failure to shear failure. With the increase in the level of σ1, the accumulative micro‐cracks at the unloading point and micro‐crack generation rate during the unloading phase exhibit increasing trends, while the ratio between the number of tensile micro‐cracks and shear micro‐cracks generally shows a downward trend. The formation of macro fracture in sandstone sample is closely related to the material inhomogeneity and true‐triaxial stress state. Abstract In this research, we conducted both laboratory experiments and discrete element simulations to investigate the influence of maximum principal stress level on true‐triaxial unloading behaviors of sandstone samples. The results show that as the level of σ 1 at the unloading point increases, the ultimate bearing capacity of sandstone sample is increasingly strengthened, while the sample collapses more easily during the unloading process, and the failure mode of sample changes from mixed tensile‐shear failure to shear failure. With the increase in the level of σ 1 , the accumulative micro‐cracks at the unloading point and micro‐crack generation rate during the unloading phase exhibit increasing trends, while the ratio between the number of tensile micro‐cracks and shear micro‐cracks generally shows a downward trend. The formation of macro fracture in sandstone sample is closely related to the material inhomogeneity and true‐triaxial stress state. |
| Author | Wu, Fei Zhang, Jian‐Zhi Xiao, Fan Liu, Wei Jiang, De‐Yi Chen, Jie |
| Author_xml | – sequence: 1 givenname: Fan surname: Xiao fullname: Xiao, Fan organization: Chongqing University – sequence: 2 givenname: De‐Yi surname: Jiang fullname: Jiang, De‐Yi email: deyij@cqu.edu.cn organization: Chongqing University – sequence: 3 givenname: Fei orcidid: 0000-0003-3140-6954 surname: Wu fullname: Wu, Fei email: wufei3616@cqu.edu.cn organization: Chongqing University – sequence: 4 givenname: Jie surname: Chen fullname: Chen, Jie organization: Chongqing University – sequence: 5 givenname: Jian‐Zhi orcidid: 0000-0003-0990-2193 surname: Zhang fullname: Zhang, Jian‐Zhi organization: Chongqing University – sequence: 6 givenname: Wei surname: Liu fullname: Liu, Wei organization: Chongqing University |
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| SubjectTerms | Axial stress Bearing capacity Cracks Discrete element method discrete element simulations failure mechanism Failure modes Inhomogeneity maximum principal stress Sandstone Shear true‐triaxial unloading |
| Title | Deformation and failure characteristics of sandstone subjected to true‐triaxial unloading: An experimental and numerical study |
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