A New Unified Solution for Deep Tunnels in Water-Rich Areas considering Pore Water Pressure
Pore water pressure has an important influence on the stresses and deformation of the surrounding rock of deep tunnels in water-rich areas. In this study, a mechanical model for deep tunnels subjected to a nonuniform stress field in water-rich areas is developed. Considering the pore water pressure,...
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| Format: | Article |
| Language: | English |
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Wiley
2021-01-01
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| Series: | Geofluids |
| Online Access: | http://dx.doi.org/10.1155/2021/6696757 |
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| _version_ | 1832550560176275456 |
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| author | Hao Fan Lianguo Wang Shuai Wang Chongyang Jiang |
| author_facet | Hao Fan Lianguo Wang Shuai Wang Chongyang Jiang |
| author_sort | Hao Fan |
| collection | DOAJ |
| description | Pore water pressure has an important influence on the stresses and deformation of the surrounding rock of deep tunnels in water-rich areas. In this study, a mechanical model for deep tunnels subjected to a nonuniform stress field in water-rich areas is developed. Considering the pore water pressure, a new unified solution for the stresses, postpeak zone radii, and surface displacement is derived based on a strain-softening model and the Mogi-Coulomb criterion. Through a case study, the effects of pore water pressure, intermediate principal stress, and residual cohesion on the stress distribution, postpeak zone radii, and surface displacement are also discussed. Results show that the tangential stresses are always larger than the radial stress. The radial stress presents a gradually increasing trend, while the tangential stress presents a trend of first increasing and then decreasing, and the maximum tangential stress appears at the interface between the elastic and plastic zones. As the pore water pressure increases, the postpeak zone radii and surface displacement increase. Because of the neglect of the intermediate principal stress in the Mohr-Coulomb criterion, the postpeak zone radii, surface displacement, and maximum tangential stress solved by the Mohr-Coulomb criterion are all larger than those solved by the Mogi-Coulomb criterion. Tunnels surrounded by rock masses with a higher residual cohesion experience lower postpeak zone radii and surface displacement. Data presented in this study provide an important theoretical basis for supporting the tunnels in water-rich areas. |
| format | Article |
| id | doaj-art-6b2ed7621dc44159b1273bf90da27803 |
| institution | Kabale University |
| issn | 1468-8115 1468-8123 |
| language | English |
| publishDate | 2021-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geofluids |
| spelling | doaj-art-6b2ed7621dc44159b1273bf90da278032025-02-03T06:06:29ZengWileyGeofluids1468-81151468-81232021-01-01202110.1155/2021/66967576696757A New Unified Solution for Deep Tunnels in Water-Rich Areas considering Pore Water PressureHao Fan0Lianguo Wang1Shuai Wang2Chongyang Jiang3State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou 221116, ChinaState Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou 221116, ChinaState Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou 221116, ChinaState Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou 221116, ChinaPore water pressure has an important influence on the stresses and deformation of the surrounding rock of deep tunnels in water-rich areas. In this study, a mechanical model for deep tunnels subjected to a nonuniform stress field in water-rich areas is developed. Considering the pore water pressure, a new unified solution for the stresses, postpeak zone radii, and surface displacement is derived based on a strain-softening model and the Mogi-Coulomb criterion. Through a case study, the effects of pore water pressure, intermediate principal stress, and residual cohesion on the stress distribution, postpeak zone radii, and surface displacement are also discussed. Results show that the tangential stresses are always larger than the radial stress. The radial stress presents a gradually increasing trend, while the tangential stress presents a trend of first increasing and then decreasing, and the maximum tangential stress appears at the interface between the elastic and plastic zones. As the pore water pressure increases, the postpeak zone radii and surface displacement increase. Because of the neglect of the intermediate principal stress in the Mohr-Coulomb criterion, the postpeak zone radii, surface displacement, and maximum tangential stress solved by the Mohr-Coulomb criterion are all larger than those solved by the Mogi-Coulomb criterion. Tunnels surrounded by rock masses with a higher residual cohesion experience lower postpeak zone radii and surface displacement. Data presented in this study provide an important theoretical basis for supporting the tunnels in water-rich areas.http://dx.doi.org/10.1155/2021/6696757 |
| spellingShingle | Hao Fan Lianguo Wang Shuai Wang Chongyang Jiang A New Unified Solution for Deep Tunnels in Water-Rich Areas considering Pore Water Pressure Geofluids |
| title | A New Unified Solution for Deep Tunnels in Water-Rich Areas considering Pore Water Pressure |
| title_full | A New Unified Solution for Deep Tunnels in Water-Rich Areas considering Pore Water Pressure |
| title_fullStr | A New Unified Solution for Deep Tunnels in Water-Rich Areas considering Pore Water Pressure |
| title_full_unstemmed | A New Unified Solution for Deep Tunnels in Water-Rich Areas considering Pore Water Pressure |
| title_short | A New Unified Solution for Deep Tunnels in Water-Rich Areas considering Pore Water Pressure |
| title_sort | new unified solution for deep tunnels in water rich areas considering pore water pressure |
| url | http://dx.doi.org/10.1155/2021/6696757 |
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