Numerical Simulation of Ultra-Shallow Buried Large-Span Double-Arch Tunnel Excavated under an Expressway
Abstract
:1. Introduction
2. Overview of the Engineering
3. Numerical Model
3.1. Establishment of Numerical Model
3.2. Material Parameters
4. Numerical Results and Discussion
4.1. Numerical Model Accuracy Verification
4.2. Analysis of Numerical Simulation Results of Pilot Tunnel Excavation
4.2.1. Deformation Analysis of Surface and Surrounding Rock
4.2.2. Lining Deformation Analysis
4.2.3. Deformation Analysis of Supporting Structure
4.3. Analysis of Numerical Simulation Results of Main Tunnel Excavation
4.3.1. Deformation Analysis of Surface and Surrounding Rock
4.3.2. Lining Deformation Analysis
4.3.3. Deformation Analysis of the Middle Partition Wall
4.3.4. Deformation Analysis of Underground Pipelines
5. Conclusions
- (1)
- When the tunnel was excavated to the fault fracture zone, the maximum vertical deformation of the surface, surrounding rock and vault increased suddenly, and the horizontal displacement of rock and soil around the pilot tunnel increased obviously. When crossing the distribution area of the fault fracture zone, the excavation footage should be reduced, and the primary support should be applied as soon as possible after the excavation was completed.
- (2)
- The vertical deformation of the lining caused by pilot tunnel excavation was small, indicating that the lining structure design was reasonable.
- (3)
- Among the three pilot tunnels, the vault settlement of the middle pilot tunnel was the largest, and the maximum settlement of the left pilot tunnel and the right pilot tunnel was similar. The rock and soil within 20 m behind the excavation face were greatly disturbed by excavation.
- (4)
- During the excavation of the main tunnel, the horizontal displacement of the central partition wall moved slightly towards the main tunnel excavated first.
- (5)
- During the excavation of the double-arch tunnel, the maximum vertical displacement of the underground pipeline occurred at the position where the central axis of the middle partition wall deviates to the post excavated the main tunnel.
Author Contributions
Funding
Data Availability Statement
Conflicts of Interest
References
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Material | Density (kg/m3) | Elastic Modulus (MPa) | Poisson’s Ratio | Frictional Angle (°) | Cohesive Force (kPa) | Coefficient of Permeability (10−6 m·s) | Thickness (m) |
---|---|---|---|---|---|---|---|
Miscellaneous fill | 1510 | 10.76 | 0.32 | 19.4 | 26.8 | 52.52 | 2~13.46 |
Completely weathered granite | 1630 | 13.00 | 0.35 | 23.4 | 49.4 | 63.00 | 10 |
Strongly weathered Diabase | 1680 | 200.00 | 0.3 | 30.5 | 56.5 | 53.00 | 32 |
Fault fracture zone | 1430 | 18.00 | 0.42 | 22.0 | 26.95 | 16.0 | 25 |
Pipeline | 1400 | 2000 | 0.34 | — | — | — | 0.01 |
Contact surfaces | — | Kn = 964.7 | Ks = 964.7 | 30.4 | 242 | — | — |
The pilot tunnel lining | 2500 | 25,000 | 0.23 | — | — | — | 0.24 |
Inverted arch initial support | 2600 | 34,000.00 | 0.15 | — | — | — | 0.3 |
Partition | 2500 | 30,000.00 | 0.20 | — | — | — | — |
Primary lining | 2600 | 34,000.00 | 0.15 | — | — | — | 0.3 |
Secondary lining | 2550 | 32,000.00 | 0.15 | — | — | — | 0.22 |
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Wang, J.; Cao, A.; Wu, Z.; Sun, Z.; Lin, X.; Sun, L.; Liu, X.; Li, H.; Sun, Y. Numerical Simulation of Ultra-Shallow Buried Large-Span Double-Arch Tunnel Excavated under an Expressway. Appl. Sci. 2022, 12, 39. https://doi.org/10.3390/app12010039
Wang J, Cao A, Wu Z, Sun Z, Lin X, Sun L, Liu X, Li H, Sun Y. Numerical Simulation of Ultra-Shallow Buried Large-Span Double-Arch Tunnel Excavated under an Expressway. Applied Sciences. 2022; 12(1):39. https://doi.org/10.3390/app12010039
Chicago/Turabian StyleWang, Jianxiu, Ansheng Cao, Zhao Wu, Zhipeng Sun, Xiao Lin, Lei Sun, Xiaotian Liu, Huboqiang Li, and Yuanwei Sun. 2022. "Numerical Simulation of Ultra-Shallow Buried Large-Span Double-Arch Tunnel Excavated under an Expressway" Applied Sciences 12, no. 1: 39. https://doi.org/10.3390/app12010039
APA StyleWang, J., Cao, A., Wu, Z., Sun, Z., Lin, X., Sun, L., Liu, X., Li, H., & Sun, Y. (2022). Numerical Simulation of Ultra-Shallow Buried Large-Span Double-Arch Tunnel Excavated under an Expressway. Applied Sciences, 12(1), 39. https://doi.org/10.3390/app12010039