Numerical solution for circular tunnel excavated in strain-softening rock masses considering damaged zone
Abstract Despite the extensive investigation on the stress and displacement distributions in tunnels, few have considered the influences of the damaged zone around a tunnel on the strength and stiffness parameters of the surrounding rock, including the gradual variation in the damaged factor D and d...
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Nature Portfolio
2022-03-01
|
| Series: | Scientific Reports |
| Online Access: | https://doi.org/10.1038/s41598-022-08531-3 |
| _version_ | 1818318888762343424 |
|---|---|
| author | Jinwang Li Caihua Shen Xiufeng He Xiangtian Zheng Jiaojiao Yuan |
| author_facet | Jinwang Li Caihua Shen Xiufeng He Xiangtian Zheng Jiaojiao Yuan |
| author_sort | Jinwang Li |
| collection | DOAJ |
| description | Abstract Despite the extensive investigation on the stress and displacement distributions in tunnels, few have considered the influences of the damaged zone around a tunnel on the strength and stiffness parameters of the surrounding rock, including the gradual variation in the damaged factor D and dimensionless damaged radius $$\rho^{{\text{d}}}$$ ρ d , under the effect of excavation disturbance. In this paper, a numerical solution is presented for the stresses and displacement of a circular tunnel excavated in a Hoek–Brown rock mass considering the progressive destruction of the damaged zone. First, the results obtained using the proposed algorithm are compared with those obtained using other numerical solutions, demonstrating a high degree of accuracy through some examples. Second, the influences of the damaged factor $$D$$ D and dimensionless damaged radius $$\rho^{d}$$ ρ d on the stresses, radial displacement, plastic radii, and ground response curve are investigated. The results show that, as the damaged factor D increases, the radial displacement and plastic radius increase, whereas the tangential stress decreases. Both the plastic radius and displacement decrease with decreasing $$\rho^{{\text{d}}}$$ ρ d . This shows that the damaged factor D has a significant effect on tunnel convergence. |
| first_indexed | 2024-12-13T10:00:23Z |
| format | Article |
| id | doaj.art-b4f37bf8288241cf95d1a7a9d8e668dd |
| institution | Directory Open Access Journal |
| issn | 2045-2322 |
| language | English |
| last_indexed | 2024-12-13T10:00:23Z |
| publishDate | 2022-03-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Scientific Reports |
| spelling | doaj.art-b4f37bf8288241cf95d1a7a9d8e668dd2022-12-21T23:51:41ZengNature PortfolioScientific Reports2045-23222022-03-0112111710.1038/s41598-022-08531-3Numerical solution for circular tunnel excavated in strain-softening rock masses considering damaged zoneJinwang Li0Caihua Shen1Xiufeng He2Xiangtian Zheng3Jiaojiao Yuan4School of Earth Sciences and Engineering, Hohai UniversitySchool of Civil and Transportation Engineering, Hohai UniversitySchool of Earth Sciences and Engineering, Hohai UniversitySchool of Computer Engineering, Nanjing Institute of TechnologySchool of Construction Engineering, Jiangsu Open UniversityAbstract Despite the extensive investigation on the stress and displacement distributions in tunnels, few have considered the influences of the damaged zone around a tunnel on the strength and stiffness parameters of the surrounding rock, including the gradual variation in the damaged factor D and dimensionless damaged radius $$\rho^{{\text{d}}}$$ ρ d , under the effect of excavation disturbance. In this paper, a numerical solution is presented for the stresses and displacement of a circular tunnel excavated in a Hoek–Brown rock mass considering the progressive destruction of the damaged zone. First, the results obtained using the proposed algorithm are compared with those obtained using other numerical solutions, demonstrating a high degree of accuracy through some examples. Second, the influences of the damaged factor $$D$$ D and dimensionless damaged radius $$\rho^{d}$$ ρ d on the stresses, radial displacement, plastic radii, and ground response curve are investigated. The results show that, as the damaged factor D increases, the radial displacement and plastic radius increase, whereas the tangential stress decreases. Both the plastic radius and displacement decrease with decreasing $$\rho^{{\text{d}}}$$ ρ d . This shows that the damaged factor D has a significant effect on tunnel convergence.https://doi.org/10.1038/s41598-022-08531-3 |
| spellingShingle | Jinwang Li Caihua Shen Xiufeng He Xiangtian Zheng Jiaojiao Yuan Numerical solution for circular tunnel excavated in strain-softening rock masses considering damaged zone Scientific Reports |
| title | Numerical solution for circular tunnel excavated in strain-softening rock masses considering damaged zone |
| title_full | Numerical solution for circular tunnel excavated in strain-softening rock masses considering damaged zone |
| title_fullStr | Numerical solution for circular tunnel excavated in strain-softening rock masses considering damaged zone |
| title_full_unstemmed | Numerical solution for circular tunnel excavated in strain-softening rock masses considering damaged zone |
| title_short | Numerical solution for circular tunnel excavated in strain-softening rock masses considering damaged zone |
| title_sort | numerical solution for circular tunnel excavated in strain softening rock masses considering damaged zone |
| url | https://doi.org/10.1038/s41598-022-08531-3 |
| work_keys_str_mv | AT jinwangli numericalsolutionforcirculartunnelexcavatedinstrainsofteningrockmassesconsideringdamagedzone AT caihuashen numericalsolutionforcirculartunnelexcavatedinstrainsofteningrockmassesconsideringdamagedzone AT xiufenghe numericalsolutionforcirculartunnelexcavatedinstrainsofteningrockmassesconsideringdamagedzone AT xiangtianzheng numericalsolutionforcirculartunnelexcavatedinstrainsofteningrockmassesconsideringdamagedzone AT jiaojiaoyuan numericalsolutionforcirculartunnelexcavatedinstrainsofteningrockmassesconsideringdamagedzone |