Research Article
Effect of the Double-Line Spiral Tunnel Curvature on the Tunnel Construction Stability
Table 1
The material parameters of the tunnel numerical model.
| | Rock | | Cohesion (kPa) | Friction angle (°) | Volumetric weight (kNm−3) | Elastic modulus (GPa) | Poisson’s ratio | | 900 | 45 | 26.5 | 6.5 | 0.20 |
| | Anchor | | Stiffness of cement slurry per unit length (MPa) | Elastic modulus (GPa) | Cross-sectional area (mm2) | | 17.6 | 210 | 380 |
| | Initial lining | Secondary lining | | Elastic modulus (GPa) | Poisson ratio | Elastic modulus (GPa) | Poisson ratio | | 10 | 0.2 | 10 | 0.2 |
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