Study on the long-term performance of shield tunnel passing through the gas-bearing strata
When the shield tunnel passes through the gas-bearing strata, gas and water leakage may occur depending on the sealing performance of the segment joints. This process involves the complex multiphase seepage flow phenomenon in unsaturated soil. In this study, a fully coupled solid-liquid-gas model of...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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KeAi Communications Co., Ltd.
2023-04-01
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| Series: | Underground Space |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2467967422000940 |
| _version_ | 1797701802953539584 |
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| author | Jie He Xiangyang Wei Mei Yin |
| author_facet | Jie He Xiangyang Wei Mei Yin |
| author_sort | Jie He |
| collection | DOAJ |
| description | When the shield tunnel passes through the gas-bearing strata, gas and water leakage may occur depending on the sealing performance of the segment joints. This process involves the complex multiphase seepage flow phenomenon in unsaturated soil. In this study, a fully coupled solid-liquid-gas model of the GIL Utility Tunnel was established to investigate the influence of the high-pressure gas on the mechanical properties of the tunnel segments and joints. The constitutive model of the Extended Barcelona Basic Model was implemented to simulate the effect of the seepage process on soil deformation. The results show that significant upward displacement occurred in the gas reservoir and its overlying strata, and the maximum displacement reached 30 mm. In addition, during the leakage of the gas and the water, an increase in the average soil effective stress was observed. It would induce a reduction in the suction and expansion of the yield surface. The tunnel tended to be stable from 20 years onwards, thus the soil deformation due to the water leakage only occurred at the early stage. In addition, the joint opening under the most unfavorable internal force combination was 0.69 mm, and the corresponding bolt stress was 119.5 MPa, which is below the yield limit. The results of this study help to understand the influence of high-pressure gas on tunnel safety and the sealing performance of the joints. |
| first_indexed | 2024-03-12T04:41:56Z |
| format | Article |
| id | doaj.art-650452b5c80a42bdbd4c1fac3e9d1d74 |
| institution | Directory Open Access Journal |
| issn | 2467-9674 |
| language | English |
| last_indexed | 2024-03-12T04:41:56Z |
| publishDate | 2023-04-01 |
| publisher | KeAi Communications Co., Ltd. |
| record_format | Article |
| series | Underground Space |
| spelling | doaj.art-650452b5c80a42bdbd4c1fac3e9d1d742023-09-03T09:38:25ZengKeAi Communications Co., Ltd.Underground Space2467-96742023-04-019119Study on the long-term performance of shield tunnel passing through the gas-bearing strataJie He0Xiangyang Wei1Mei Yin2College of Civil Engineering, Tongji University, Shanghai 200092, China; State Key Laboratory for Disaster Reduction in Civil Engineering, Tongji University, Shanghai 200092, ChinaCollege of Civil Engineering, Tongji University, Shanghai 200092, China; Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, ChinaCollege of Civil Engineering, Tongji University, Shanghai 200092, China; State Key Laboratory for Disaster Reduction in Civil Engineering, Tongji University, Shanghai 200092, China; Civil and Environmental Engineering Department, Brunel University London, London UB8 3PH, UK; Corresponding author at: Civil and Environmental Engineering Department, Brunel University, London, UK.When the shield tunnel passes through the gas-bearing strata, gas and water leakage may occur depending on the sealing performance of the segment joints. This process involves the complex multiphase seepage flow phenomenon in unsaturated soil. In this study, a fully coupled solid-liquid-gas model of the GIL Utility Tunnel was established to investigate the influence of the high-pressure gas on the mechanical properties of the tunnel segments and joints. The constitutive model of the Extended Barcelona Basic Model was implemented to simulate the effect of the seepage process on soil deformation. The results show that significant upward displacement occurred in the gas reservoir and its overlying strata, and the maximum displacement reached 30 mm. In addition, during the leakage of the gas and the water, an increase in the average soil effective stress was observed. It would induce a reduction in the suction and expansion of the yield surface. The tunnel tended to be stable from 20 years onwards, thus the soil deformation due to the water leakage only occurred at the early stage. In addition, the joint opening under the most unfavorable internal force combination was 0.69 mm, and the corresponding bolt stress was 119.5 MPa, which is below the yield limit. The results of this study help to understand the influence of high-pressure gas on tunnel safety and the sealing performance of the joints.http://www.sciencedirect.com/science/article/pii/S2467967422000940A coupled solid-liquid-gas modelUnsaturated soilMultiphase seepageGas-bearing strataShield tunnelFEM |
| spellingShingle | Jie He Xiangyang Wei Mei Yin Study on the long-term performance of shield tunnel passing through the gas-bearing strata Underground Space A coupled solid-liquid-gas model Unsaturated soil Multiphase seepage Gas-bearing strata Shield tunnel FEM |
| title | Study on the long-term performance of shield tunnel passing through the gas-bearing strata |
| title_full | Study on the long-term performance of shield tunnel passing through the gas-bearing strata |
| title_fullStr | Study on the long-term performance of shield tunnel passing through the gas-bearing strata |
| title_full_unstemmed | Study on the long-term performance of shield tunnel passing through the gas-bearing strata |
| title_short | Study on the long-term performance of shield tunnel passing through the gas-bearing strata |
| title_sort | study on the long term performance of shield tunnel passing through the gas bearing strata |
| topic | A coupled solid-liquid-gas model Unsaturated soil Multiphase seepage Gas-bearing strata Shield tunnel FEM |
| url | http://www.sciencedirect.com/science/article/pii/S2467967422000940 |
| work_keys_str_mv | AT jiehe studyonthelongtermperformanceofshieldtunnelpassingthroughthegasbearingstrata AT xiangyangwei studyonthelongtermperformanceofshieldtunnelpassingthroughthegasbearingstrata AT meiyin studyonthelongtermperformanceofshieldtunnelpassingthroughthegasbearingstrata |