A Study on the Influence of Dewatering in the Excavation of Adjacent Tunnels under Lateral Soil Effects
The dewatering of foundation pits leads to changes in the water level and effective stress within the surrounding strata. When existing tunnels are present within the dewatering influence zone, the impact of dewatering on these tunnels cannot be ignored. The Vlasov foundation beam model was used to...
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MDPI AG
2023-12-01
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| Series: | Applied Sciences |
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| Online Access: | https://www.mdpi.com/2076-3417/14/1/102 |
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| author | Xinhuan Liang Lingxiao Guan Yuzhe Tang Ming Chen Junren Peng Changjie Xu |
| author_facet | Xinhuan Liang Lingxiao Guan Yuzhe Tang Ming Chen Junren Peng Changjie Xu |
| author_sort | Xinhuan Liang |
| collection | DOAJ |
| description | The dewatering of foundation pits leads to changes in the water level and effective stress within the surrounding strata. When existing tunnels are present within the dewatering influence zone, the impact of dewatering on these tunnels cannot be ignored. The Vlasov foundation beam model was used to simulate the interaction between the tunnel and the soil, and the key parameters of the model were precisely investigated. In addition, the constraining effect of the lateral soil on the tunnel was also considered. By integrating the principles of effective stress and Dupuit’s assumption, in this work we calculated the additional load on the tunnel caused by foundation pit dewatering, which was then applied to determine the tunnel stress and deformation induced by dewatering. The accuracy of this approach is validated through comparative analysis with finite element results. Furthermore, the relationships between the permeability coefficient (<i>k</i><sub>t</sub>), the spacing (<i>d</i>) between the tunnel and the dewatering well, the water level drop (<i>s</i><sub>w</sub>), and tunnel stress and deformation were further studied. The key findings are summarized as follows. Firstly, accounting for lateral soil effects enhances computational accuracy. Secondly, an increase in soil <i>k</i><sub>t</sub> leads to a greater tunnel settlement with relatively minor changes in bending moments. Thirdly, as d increases, both tunnel settlements and bending moments decrease. Additionally, as the water level dropped from 10 m to 30 m, the maximum additional stress on the tunnel increased by 94.50%, and the settlement increased by 127.43%. Consequently, it is essential to pay close attention to the tunnel segment nearest to the water level. |
| first_indexed | 2024-03-08T15:12:55Z |
| format | Article |
| id | doaj.art-f739bb141371409b8c6ae37ae2dde401 |
| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-03-08T15:12:55Z |
| publishDate | 2023-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Applied Sciences |
| spelling | doaj.art-f739bb141371409b8c6ae37ae2dde4012024-01-10T14:50:56ZengMDPI AGApplied Sciences2076-34172023-12-0114110210.3390/app14010102A Study on the Influence of Dewatering in the Excavation of Adjacent Tunnels under Lateral Soil EffectsXinhuan Liang0Lingxiao Guan1Yuzhe Tang2Ming Chen3Junren Peng4Changjie Xu5Nanchang Rail Transit Group Limited Corporation, Nanchang 330013, ChinaThe Key Laboratory of Performance Monitoring Protecting of Rail Transit Infrastructure, East China Jiaotong University, Nanchang 330013, ChinaThe Key Laboratory of Performance Monitoring Protecting of Rail Transit Infrastructure, East China Jiaotong University, Nanchang 330013, ChinaNanchang Rail Transit Group Limited Corporation, Nanchang 330013, ChinaNanchang Rail Transit Group Limited Corporation, Nanchang 330013, ChinaThe Key Laboratory of Performance Monitoring Protecting of Rail Transit Infrastructure, East China Jiaotong University, Nanchang 330013, ChinaThe dewatering of foundation pits leads to changes in the water level and effective stress within the surrounding strata. When existing tunnels are present within the dewatering influence zone, the impact of dewatering on these tunnels cannot be ignored. The Vlasov foundation beam model was used to simulate the interaction between the tunnel and the soil, and the key parameters of the model were precisely investigated. In addition, the constraining effect of the lateral soil on the tunnel was also considered. By integrating the principles of effective stress and Dupuit’s assumption, in this work we calculated the additional load on the tunnel caused by foundation pit dewatering, which was then applied to determine the tunnel stress and deformation induced by dewatering. The accuracy of this approach is validated through comparative analysis with finite element results. Furthermore, the relationships between the permeability coefficient (<i>k</i><sub>t</sub>), the spacing (<i>d</i>) between the tunnel and the dewatering well, the water level drop (<i>s</i><sub>w</sub>), and tunnel stress and deformation were further studied. The key findings are summarized as follows. Firstly, accounting for lateral soil effects enhances computational accuracy. Secondly, an increase in soil <i>k</i><sub>t</sub> leads to a greater tunnel settlement with relatively minor changes in bending moments. Thirdly, as d increases, both tunnel settlements and bending moments decrease. Additionally, as the water level dropped from 10 m to 30 m, the maximum additional stress on the tunnel increased by 94.50%, and the settlement increased by 127.43%. Consequently, it is essential to pay close attention to the tunnel segment nearest to the water level.https://www.mdpi.com/2076-3417/14/1/102foundation pit dewateringexisting tunneleffective stress principleeffects of lateral soilVlasov foundation model |
| spellingShingle | Xinhuan Liang Lingxiao Guan Yuzhe Tang Ming Chen Junren Peng Changjie Xu A Study on the Influence of Dewatering in the Excavation of Adjacent Tunnels under Lateral Soil Effects Applied Sciences foundation pit dewatering existing tunnel effective stress principle effects of lateral soil Vlasov foundation model |
| title | A Study on the Influence of Dewatering in the Excavation of Adjacent Tunnels under Lateral Soil Effects |
| title_full | A Study on the Influence of Dewatering in the Excavation of Adjacent Tunnels under Lateral Soil Effects |
| title_fullStr | A Study on the Influence of Dewatering in the Excavation of Adjacent Tunnels under Lateral Soil Effects |
| title_full_unstemmed | A Study on the Influence of Dewatering in the Excavation of Adjacent Tunnels under Lateral Soil Effects |
| title_short | A Study on the Influence of Dewatering in the Excavation of Adjacent Tunnels under Lateral Soil Effects |
| title_sort | study on the influence of dewatering in the excavation of adjacent tunnels under lateral soil effects |
| topic | foundation pit dewatering existing tunnel effective stress principle effects of lateral soil Vlasov foundation model |
| url | https://www.mdpi.com/2076-3417/14/1/102 |
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