Multiple Water and Sand Leakage Model Tests for Shield Tunnels
Water and sand leakage in shield tunnels has become more of a research interest in recent years. On the other hand, accidents involving underground engineering can take many forms and occur often. These accidents pose a risk to people’s lives as well as their property, and it is imperative that stud...
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MDPI AG
2024-11-01
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| author | Emmet Amonee Greene Gang Zheng Xuesong Cheng Cui Zhaolin |
| author_facet | Emmet Amonee Greene Gang Zheng Xuesong Cheng Cui Zhaolin |
| author_sort | Emmet Amonee Greene |
| collection | DOAJ |
| description | Water and sand leakage in shield tunnels has become more of a research interest in recent years. On the other hand, accidents involving underground engineering can take many forms and occur often. These accidents pose a risk to people’s lives as well as their property, and it is imperative that studies on underground engineering catastrophes be conducted without delay. In this paper, a technique for indoor model tests for disaster and erosion in shield tunnels is utilized to investigate the process of crater, water, and sand leakage evolution in shield tunnels. The change in water pressure at the leaking joint is inversely proportional to the magnitude of the water input rate, and the change in soil pressure is inversely proportional to the distance from the leakage joint. Both changes occurred in the same direction. Notably, the soil’s initial effective stress was also considered to maintain compatibility with actual engineering works. The preliminary findings suggest that soil-effective stress may cause erosion resulting in the soil arching effect. Tests with one and two leakage spots were carried out using this foundation. Compared to the scenario where two leakage sites are opened simultaneously, it was discovered that opening the two leakage points one after the other might result in a more extensive erosion area of superposition. The double leakage point test results indicate that the point where leakage occurs first causes another leakage point because the erosion area created when two leakage points are opened successively will be larger than the erosion area created when two leakage points are opened simultaneously. When two leakage points under a tunnel are close to each other, the width and depth of the soil erosion groove under the tunnel caused by the two leakage points leaking one after another are significantly larger than those caused by two leakage points leaking simultaneously and are also substantially larger than a single leakage point. After a leakage disaster occurs in the tunnel, the water and soil pressure near the leakage point will continue to decrease. The closer the leakage point, the greater the reduction. Until the leakage erosion converges, the water and soil pressure will tend to stabilize. |
| format | Article |
| id | doaj-art-2e58aa0081e3474192e75fd0a9827f26 |
| institution | DOAJ |
| issn | 2075-5309 |
| language | English |
| publishDate | 2024-11-01 |
| publisher | MDPI AG |
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| series | Buildings |
| spelling | doaj-art-2e58aa0081e3474192e75fd0a9827f262025-08-20T02:53:34ZengMDPI AGBuildings2075-53092024-11-011412382010.3390/buildings14123820Multiple Water and Sand Leakage Model Tests for Shield TunnelsEmmet Amonee Greene0Gang Zheng1Xuesong Cheng2Cui Zhaolin3MOE Key Laboratory of Coast Civil Structure Safety, Tianjin University, Tianjin 300072, ChinaDepartment of Civil Engineering, Tianjin University, Tianjin 300072, ChinaDepartment of Civil Engineering, Tianjin University, Tianjin 300072, ChinaDepartment of Civil Engineering, Tianjin University, Tianjin 300072, ChinaWater and sand leakage in shield tunnels has become more of a research interest in recent years. On the other hand, accidents involving underground engineering can take many forms and occur often. These accidents pose a risk to people’s lives as well as their property, and it is imperative that studies on underground engineering catastrophes be conducted without delay. In this paper, a technique for indoor model tests for disaster and erosion in shield tunnels is utilized to investigate the process of crater, water, and sand leakage evolution in shield tunnels. The change in water pressure at the leaking joint is inversely proportional to the magnitude of the water input rate, and the change in soil pressure is inversely proportional to the distance from the leakage joint. Both changes occurred in the same direction. Notably, the soil’s initial effective stress was also considered to maintain compatibility with actual engineering works. The preliminary findings suggest that soil-effective stress may cause erosion resulting in the soil arching effect. Tests with one and two leakage spots were carried out using this foundation. Compared to the scenario where two leakage sites are opened simultaneously, it was discovered that opening the two leakage points one after the other might result in a more extensive erosion area of superposition. The double leakage point test results indicate that the point where leakage occurs first causes another leakage point because the erosion area created when two leakage points are opened successively will be larger than the erosion area created when two leakage points are opened simultaneously. When two leakage points under a tunnel are close to each other, the width and depth of the soil erosion groove under the tunnel caused by the two leakage points leaking one after another are significantly larger than those caused by two leakage points leaking simultaneously and are also substantially larger than a single leakage point. After a leakage disaster occurs in the tunnel, the water and soil pressure near the leakage point will continue to decrease. The closer the leakage point, the greater the reduction. Until the leakage erosion converges, the water and soil pressure will tend to stabilize.https://www.mdpi.com/2075-5309/14/12/3820multiple leakageerosionshield tunnelsuccessively openingeffective stress |
| spellingShingle | Emmet Amonee Greene Gang Zheng Xuesong Cheng Cui Zhaolin Multiple Water and Sand Leakage Model Tests for Shield Tunnels Buildings multiple leakage erosion shield tunnel successively opening effective stress |
| title | Multiple Water and Sand Leakage Model Tests for Shield Tunnels |
| title_full | Multiple Water and Sand Leakage Model Tests for Shield Tunnels |
| title_fullStr | Multiple Water and Sand Leakage Model Tests for Shield Tunnels |
| title_full_unstemmed | Multiple Water and Sand Leakage Model Tests for Shield Tunnels |
| title_short | Multiple Water and Sand Leakage Model Tests for Shield Tunnels |
| title_sort | multiple water and sand leakage model tests for shield tunnels |
| topic | multiple leakage erosion shield tunnel successively opening effective stress |
| url | https://www.mdpi.com/2075-5309/14/12/3820 |
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