Analysis of the Impact of the New Two-Lane Shield Tunnel Underpass on the Existing Tunnels
Abstract
:1. Introduction
2. Theoretical Analysis of Vertical Settlement in Underpass Tunnels
2.1. Underlying Assumption
2.2. Modification of Peck’s Formula
2.3. Two-Lane Tunnel Excavation Prediction of Settlement Calculation for Existing Tunnels
3. Numerical Simulation of Underpass Construction
3.1. Project Overview
3.2. Numerical Model and Parameter Selection
3.3. Shield Construction Process Simulation
3.4. Analysis of Simulation Results
3.4.1. Influence of Two-Lane Shield Underpass on Vertical Settlement of Existing Tunnels
3.4.2. Analysis of Additional Stresses on Existing Tunnels by Double-Line Shield Penetration
3.5. Influence of Construction Parameters on the Deformation of Existing Tunnels
3.5.1. Influence of Soil Compartment Pressure on the Deformation of Existing Tunnels
3.5.2. Influence of Grouting Pressure on Deformation of the Existing Tunnels
4. Analysis of Settlement Monitoring Results
4.1. On-Site Monitoring
4.2. Theoretical Calculation, Numerical Simulation, and Monitoring Data Comparison
5. Conclusions
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
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Name of Soil Layer | Thickness/m | Heaviness/(kN·m−3) | Cohesion/(kPa) | The Angle of Internal Friction/(°) | Modulus of Elasticity/(MPa) | Poisson’s Ratio |
---|---|---|---|---|---|---|
Plain fill | 2.5 | 17 | 10 | 15 | 8 | 0.3 |
Gravel | 4 | 20 | 0 | 36 | 12,000 | 0.28 |
Fully weathered dolomite | 10 | 22 | 38 | 15 | 20,000 | 0.3 |
Strongly weathered dolomite | 20 | 22 | 45 | 16 | 35,000 | 0.3 |
Moderately differentiated dolomite | 23.5 | 23 | 70 | 30 | 50,000 | 0.3 |
Material Name | Weight (kN·m−3) | Modulus of Elasticity/GPa) | Poisson’s Ratio |
---|---|---|---|
Shield shell | 78 | 250 | 0.2 |
Pipe sheet | 22.5 | 20 | 0.3 |
Grouting | 24 | 21 | 0.25 |
Construction | Phase Maximum Von Mises Stress/(kN·m−2) | Minimum Von Mises Stress/(kN·m−2) |
---|---|---|
(1) | 2468 | 796 |
(2) | 32,478 | 691 |
(3) | 2774 | 556 |
(4) | 2960 | 504 |
(5) | 3109 | 480 |
(6) | 3164 | 473 |
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Li, J.; Fang, X.; Yang, Y. Analysis of the Impact of the New Two-Lane Shield Tunnel Underpass on the Existing Tunnels. Appl. Sci. 2025, 15, 2642. https://doi.org/10.3390/app15052642
Li J, Fang X, Yang Y. Analysis of the Impact of the New Two-Lane Shield Tunnel Underpass on the Existing Tunnels. Applied Sciences. 2025; 15(5):2642. https://doi.org/10.3390/app15052642
Chicago/Turabian StyleLi, Jinkui, Xinxia Fang, and Yu Yang. 2025. "Analysis of the Impact of the New Two-Lane Shield Tunnel Underpass on the Existing Tunnels" Applied Sciences 15, no. 5: 2642. https://doi.org/10.3390/app15052642
APA StyleLi, J., Fang, X., & Yang, Y. (2025). Analysis of the Impact of the New Two-Lane Shield Tunnel Underpass on the Existing Tunnels. Applied Sciences, 15(5), 2642. https://doi.org/10.3390/app15052642