Abstract
Transportation tunnels are strategic parts of all urban development projects. Challenges are faced while selecting the excavation techniques and support types in these underground constructions. Hence, sufficient information and knowledge are required while designing the shield support system in soft ground tunnelling. In this study, a two-dimensional plane strain finite element simulation of a tunnel having 350-mm thick reinforced concrete liner has been carried out. The effects of soil stratification, degree of saturation, and seismic loading have been considered for the analyses. Mohr-Coulomb’s constitutive model has been adopted to simulate the linear elastic-plastic behaviour of soil in static analysis. Furthermore, the dynamic response of horizontal shear waves (S-wave) has also been investigated on the tunnel’s model. It was observed numerically that the stresses and deformation reduced to 15% and 30% respectively when sandy silt (SM), soil layer moved towards liner in stratification analysis. The tangential and radial stresses increased by 24% and 35%, respectively, due to groundwater presence above the crown. Moreover, vertical and horizontal settlements have increased exponentially that led to a reduction in the shear strength of soil due to variation in water level. Also, ovaling (egging) deformation was observed in the liner due to the propagation of seismic shear waves at the base of the tunnel.
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Abbreviations
- σ rs :
-
Radial stress in the soil domain
- σ rl :
-
Radial stress on the liner
- σ θs :
-
Tangential stress in the soil domain
- σ θl :
-
Tangential stress in the liner
- S v :
-
Vertical surface settlement
- C :
-
Cohesion in the soil
- Ψ:
-
Dilation angle
- ρ :
-
Density of the soil
- E s :
-
Young’s modulus of the elasticity of soil
- E c :
-
Young’s modulus of elasticity of the concrete
- m :
-
Modulus number
- y :
-
Lateral distance from the center of the tunnel
- Z0 :
-
Vertical distance of the tunnel axis from surface
- V s :
-
Volume loss due to tunnelling
- K :
-
Constant for trough width
- 𝜐:
-
Poison’s ratio
- Φ:
-
Friction angle
- A x :
-
Acceleration in x-direction
- V s . :
-
Velocity of the shear wave (S-wave)
- K o :
-
Coefficient of the lateral earth pressure
- t :
-
Thickness of the liner
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Acknowledgments
The authors would like to acknowledge Mr. Manojit Samanta, Senior Scientist (CBRI-CSIR Roorkee, U.K., India) for assisting in the computational facility.
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Khan, M.A., Sadique, M.R., Harahap, I.H. et al. Static and Dynamic Analysis of the Shielded Tunnel in Alluvium Soil with 2D FEM Model. Transp. Infrastruct. Geotech. 9, 73–100 (2022). https://doi.org/10.1007/s40515-021-00160-z
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DOI: https://doi.org/10.1007/s40515-021-00160-z