Frost heave control measures for the frozen double-line tunnel undercrossing an operation station
Aiming at the frost heave characteristics of long-distance and large-section underground freezing projects in cities, the double-line tunnel of Shanghai Metro Line 18 undercrossing an operation station was select as an example,a three-dimensional numerical model was established by using finite eleme...
| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | zho |
| Published: |
Editorial Office of Journal of China Coal Society
2024-03-01
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| Series: | Meitan xuebao |
| Subjects: | |
| Online Access: | http://www.mtxb.com.cn/article/doi/10.13225/j.cnki.jccs.2023.1721 |
| _version_ | 1797232586098999296 |
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| author | Xiangsheng CHEN Hang DING Fangzheng LI Xi CHEN Wei GAO Heng WANG Lei WANG Hanqing CHEN |
| author_facet | Xiangsheng CHEN Hang DING Fangzheng LI Xi CHEN Wei GAO Heng WANG Lei WANG Hanqing CHEN |
| author_sort | Xiangsheng CHEN |
| collection | DOAJ |
| description | Aiming at the frost heave characteristics of long-distance and large-section underground freezing projects in cities, the double-line tunnel of Shanghai Metro Line 18 undercrossing an operation station was select as an example,a three-dimensional numerical model was established by using finite element software based on the thermal-mechanical coupling equation. Combined with the physical parameters obtained from laboratory tests, the evolution law of frost heave displacement field of the project was studied, and the influence of measures such as the staggered peak freezing and the adjustment of brine temperature on the frost heave displacement field was explored. Under the experimental conditions, the results show that: ① the deformation of the station floor caused by frost heave which mainly occurs in the active freezing period. When the double-line tunnel is frozen at the same time, the vertical displacement of the station floor at 45days of freezing reaches 77.72% of the displacement at 90 days of freezing. ② When the freezing time reaches 90 days, compared with simultaneous freezing, the displacement of the station floor reduced by 7.7% under the condtion of staggered peak freezing. The superposition effect of frost heave in the same time period is effectively avoided, and the frost heave effect is reduced to a certain extent. ③ When the freezing time reaches 90 days, compared with simultaneous freezing, the displacement of the station floor reduced by 34.2% under the condtion of adjusting the brine temperature, it shown that the expansion rate and frost heave effect of frozen soil are effectively controlled. In engineering practice, measures such as staggered freezing and adjusting brine temperature are used together to control frost heave, and the maximum vertical deformation of the station floor is 25.41 mm. The deformation law of the station floor obtained by numerical simulation is basically consistent with the measured data, which effectively guided the construction of the project. |
| first_indexed | 2024-04-24T16:02:37Z |
| format | Article |
| id | doaj.art-4ad433d583a84058bab53a6201997a65 |
| institution | Directory Open Access Journal |
| issn | 0253-9993 |
| language | zho |
| last_indexed | 2024-04-24T16:02:37Z |
| publishDate | 2024-03-01 |
| publisher | Editorial Office of Journal of China Coal Society |
| record_format | Article |
| series | Meitan xuebao |
| spelling | doaj.art-4ad433d583a84058bab53a6201997a652024-04-01T06:37:22ZzhoEditorial Office of Journal of China Coal SocietyMeitan xuebao0253-99932024-03-0149117218010.13225/j.cnki.jccs.2023.17212023-1721Frost heave control measures for the frozen double-line tunnel undercrossing an operation stationXiangsheng CHEN0Hang DING1Fangzheng LI2Xi CHEN3Wei GAO4Heng WANG5Lei WANG6Hanqing CHEN7China Coal Research Institute, Beijing 100013, ChinaChina Coal Research Institute, Beijing 100013, ChinaChina Coal Research Institute, Beijing 100013, ChinaCollege of Civil and Transportation Engineering, Shenzhen University, Shenzhen 518060, ChinaChina Coal Research Institute, Beijing 100013, ChinaChina Coal Research Institute, Beijing 100013, ChinaChina Coal Research Institute, Beijing 100013, ChinaCollege of Civil and Transportation Engineering, Shenzhen University, Shenzhen 518060, ChinaAiming at the frost heave characteristics of long-distance and large-section underground freezing projects in cities, the double-line tunnel of Shanghai Metro Line 18 undercrossing an operation station was select as an example,a three-dimensional numerical model was established by using finite element software based on the thermal-mechanical coupling equation. Combined with the physical parameters obtained from laboratory tests, the evolution law of frost heave displacement field of the project was studied, and the influence of measures such as the staggered peak freezing and the adjustment of brine temperature on the frost heave displacement field was explored. Under the experimental conditions, the results show that: ① the deformation of the station floor caused by frost heave which mainly occurs in the active freezing period. When the double-line tunnel is frozen at the same time, the vertical displacement of the station floor at 45days of freezing reaches 77.72% of the displacement at 90 days of freezing. ② When the freezing time reaches 90 days, compared with simultaneous freezing, the displacement of the station floor reduced by 7.7% under the condtion of staggered peak freezing. The superposition effect of frost heave in the same time period is effectively avoided, and the frost heave effect is reduced to a certain extent. ③ When the freezing time reaches 90 days, compared with simultaneous freezing, the displacement of the station floor reduced by 34.2% under the condtion of adjusting the brine temperature, it shown that the expansion rate and frost heave effect of frozen soil are effectively controlled. In engineering practice, measures such as staggered freezing and adjusting brine temperature are used together to control frost heave, and the maximum vertical deformation of the station floor is 25.41 mm. The deformation law of the station floor obtained by numerical simulation is basically consistent with the measured data, which effectively guided the construction of the project.http://www.mtxb.com.cn/article/doi/10.13225/j.cnki.jccs.2023.1721tunnelsubway stationfrost heaveunderground spacenumerical analysis |
| spellingShingle | Xiangsheng CHEN Hang DING Fangzheng LI Xi CHEN Wei GAO Heng WANG Lei WANG Hanqing CHEN Frost heave control measures for the frozen double-line tunnel undercrossing an operation station Meitan xuebao tunnel subway station frost heave underground space numerical analysis |
| title | Frost heave control measures for the frozen double-line tunnel undercrossing an operation station |
| title_full | Frost heave control measures for the frozen double-line tunnel undercrossing an operation station |
| title_fullStr | Frost heave control measures for the frozen double-line tunnel undercrossing an operation station |
| title_full_unstemmed | Frost heave control measures for the frozen double-line tunnel undercrossing an operation station |
| title_short | Frost heave control measures for the frozen double-line tunnel undercrossing an operation station |
| title_sort | frost heave control measures for the frozen double line tunnel undercrossing an operation station |
| topic | tunnel subway station frost heave underground space numerical analysis |
| url | http://www.mtxb.com.cn/article/doi/10.13225/j.cnki.jccs.2023.1721 |
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