Field Monitoring and Analysis of Factors Influencing Existing Tunnels Laterally Adjacent to Foundation Pit Excavations
Source abstract
Abstract
To investigate the factors influencing existing tunnels adjacent to foundation pit excavations, this paper focuses on a case of excavation of MTR station foundation pits near an existing tunnel. Monitoring data are collected and analyzed, and a two-dimensional numerical model of the pit–tunnel system is established using ABAQUS (2022) software. This study examines the effect of excavation factors on the tunnel, including excavation depth, horizontal spacing between pit and tunnel, support pile wall dimensions, support structure insertion ratio, horizontal support stiffness, and geological conditions. The research results indicate that for tunnels in silty clay formations, the depth of pit excavation should be limited to 20 m. When the horizontal spacing between a foundation pit and tunnel in a silty clay formation is within 1.5 times the depth of excavation, the tunnel is more significantly affected by tunnel excavation works in the adjacent pits. Increasing the horizontal support stiffness has the greatest effect on controlling deformation and stress in the tunnel structure. The degree of influence on deformation and stress in the tunnel due to laterally adjacent excavation of a foundation pit varies with geological conditions. Among them, tunnels in muddy-silty clay and silty soils are the most affected, and it is recommended that reinforcement measures be optimized and monitoring be strengthened. The conclusions of the present study can provide a reference point and guidance for the optimal design of similar pit projects.
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Research context
OpenAlex topics: Geotechnical Engineering and Analysis · Tunneling and Rock Mechanics · Geotechnical Engineering and Underground Structures
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
College of Civil Engineering, Hefei University of Technology, Hefei 230009, China
College of Civil Engineering and Transportation, Hohai university, Nanjing 210024, China
School of Civil Engineering and Surveying & Mapping Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, China
Funding
The National Natural Science Foundation of China · Major Science and Technology R&D Special Project of Jiangxi Province
References (38)
Show source-provided references
1. Development history, present situation, and future conception of urban underground space in Shenzhen
2. Current status and development of urban underground space standards at home and abroad
3. The influence and safety analysis of foundation pit unloading at the bottom of high-speed bridge
4. A static risk assessment model for underwater shield tunnel construction10.1007/s12046-020-01370-w ↗
5. Analysis of Influence on the Super-Large-Diameter Shield Tunnel by Stockpile Unloading10.1088/1755-1315/791/1/012028 ↗
6. Jiang, L., and Hao, S. (2022). Resilience Evaluation of the Existing Shield Tunnel Lining Induced by the Symmetrical Excavation of Adjacent Foundation Pit Based on Numerical Simulations. Symmetry, 14.10.3390/sym14020229 ↗
7. Simulating the effects of braced excavation on the adjacent tunnel using numerical method10.1088/1742-6596/1654/1/012121 ↗
8. Predicting longitudinal tunnel deformation due to deep excavation-induced ground movement10.1016/j.tust.2022.104793 ↗
9. Evolution of tunnel uplift and deformation induced by an upper and collinear excavation: A case study from Shenzhen metro10.1016/j.trgeo.2023.100953 ↗
10. A digital twin approach for tunnel construction safety early warning and management10.1016/j.compind.2022.103783 ↗
11. Numerical Simulation of Tieback Excavations with Soldier Piles Using a New Unified Soil Model Considering at Rest Condition10.1007/s10706-019-01002-z ↗
12. Monitoring and numerical simulation analysis of a pit-in-pit excavation of the first branch line of Lanzhou Metro10.1515/arh-2023-0111 ↗
13. Zhang, Y., Yi, L., Zhang, L., Yang, Y., Hao, X., Li, H., and Ma, H. (2022). Causation Identification and Control Measures of Deformation by Integrated Dewatering-Excavation Process Simulation of a T-Shaped Deep Foundation Pit. Water, 14.10.3390/w14040535 ↗
14. Numerical simulation and simplified analytical method to evaluate the displacement of adjacent tunnels caused by excavation10.1016/j.tust.2022.104879 ↗
15. Numerical Simulation of Deep Excavation Considering Strain-Dependent Behavior of Soil: A Case Study of Tangluo Street Station of Nanjing Metro10.1007/s40999-022-00755-8 ↗
16. Song, Z., Wu, Y., Zhang, Y., Wang, K., Tian, J., and Tian, X. (2023). Deformation Response of a Pipeline to Nearby Deep Foundation Pit Excavation: Numerical Simulations and Field Tests. Appl. Sci., 13.10.3390/app13116597 ↗
17. Influence of the subsoil model on the safety and eco-efficiency of reinforced concrete structure of rectangular liquid tank founded beneath the terrain surface10.1016/j.engstruct.2024.117571 ↗
18. Wang, M., Ye, X.-W., Jia, J.-D., Ying, X.-H., Ding, Y., Zhang, D., and Sun, F. (2024). Confining Pressure Forecasting of Shield Tunnel Lining Based on GRU Model and RNN Model. Sensors, 24.10.3390/s24030866 ↗
19. Statistical correlation between HSS model parameters and the method of parameter valuation10.1088/1755-1315/1330/1/012023 ↗
20. Research on lateral force change of side shield tunnel caused by foundation pit excavation
21. A nonlinear cyclic constitutive model for soils considering pore-water-soil-skeleton coupling effects and its numerical realization in 3D stress space
22. Three-dimensional stability of excavation face of water rich shield tunnel considering seepage effect and nonlinear failure criterion
23. Theoretical analysis of longitudinal deformation of existing tunnels induced by foundation pit excavation considering Pasternak foundation model
24. Qiu, Y., Wang, J., Zhang, C., Hua, L., and Zhou, Z. (2024). Numerical Simulation Study on the Impact of Excavation on Existing Subway Stations Based on BIM-FEM Framework. Buildings, 14.10.3390/buildings14051444 ↗
25. Chen, T., Xu, G., and Cong, Y. (2024). Surface Settlement of Shallow Shield Tunneling: Face Pressure, Tail-Void Grouting Pressure, and Grout Volume. Int. J. Geomech., 24.10.1061/IJGNAI.GMENG-9011 ↗
26. Experimental investigation on rheological properties and diffusion-related performance of clay shock slurry for excavation gap filling during shield tunnelling10.1016/j.tust.2024.105660 ↗
27. Theoretical prediction of ground settlements due to shield tunneling in multi-layered soils considering process parameters10.1016/j.undsp.2023.07.007 ↗
28. Tunnelling-induced ground deformation subjected to the behavior of tail grouting materials10.1016/j.tust.2023.105253 ↗
29. Analysis of ground surface settlement induced by the construction of a large-diameter shield-driven tunnel in Shanghai, China10.1016/j.tust.2015.10.008 ↗
30. Behaviors of existing twin subway tunnels due to new subway station excavation below in close vicinity10.1016/j.tust.2018.07.020 ↗
31. Case study of performance assessment of overlapping shield tunnels with a small curve radius10.1002/dug2.12066 ↗
32. Feng, L. (2014). Study on the Influence of Foundation Pit Excavation on the Deformation of Lateral Subway Shield Tunnel and Its Control Measures. [Master’s Thesis, South China University of Technology].
33. Yang, C. (2017). Study on the Influence of Foundation Pit Excavation on Adjacent Existing Subway Tunnels. [Master’s Thesis, Southeast University].
34. Fan, J. (2019). Research on the Influence of Deep Foundation Pit Excavation on Adjacent Subway Tunnels and Stations. [Master’s Thesis, Guangzhou University].
35. Li, F. (2018). Study on the Impact of Subway Construction on the Surrounding Environment Under Complex and Sensitive Geological Conditions in Jiangmantan, Institute of Engineering Mechanics, China Earthquake Administration.
36. Analysis of deformation characteristics of deep foundation pit of subway station in Nanjing area
37. Excessive displacement and protection measures of subway tunnel adjacent to deep foundation pit
38. Wei, S. (2010). Numerical and Centrifugal Experimental Study on the Influence of Foundation Pit Excavation on the Existing Tunnel at the Bottom of the Pit. [Ph.D. Thesis, Tianjin University].