Research Article
Stress-Strain Calculation Method of Composite Lining considering the Creep Characteristics of Tunnel Surrounding Rock
Table 1
Engineering geology and support parameters.
| | Surrounding rock | Bolt | Sprayed concrete | Secondary lining |
| | Cohesion (MPa) | 0.15 | Diameter (mm) | 18 | Concrete grade | C20 | Concrete grade | C35 | | Angle of internal friction (°) | 27 | Cross section area (mm2) | 276.6 | Thickness (mm) | 160 | Thickness (mm) | 300 | | Instantaneous shear modulus (GPa) | 1.10 | Design value of tension strength (MPa) | 300 | Internal radius (m) | 7.64 | Internal radius (m) | 7.34 | | Delayed shear modulus (GPa) | 1.34 | Length (m) | 2.1 | Shear modulus (GPa) | 28 | Shear modulus (GPa) | 31 | | Poisson’s ratio | 0.25 | Elastic modulus (GPa) | 200 | Cohesion (MPa) | 2.27 | Cohesion (MPa) | 3.18 | | Viscosity coefficient (GPad) | 105 | Spacing (m) | 1.5 | Angle of internal friction (°) | 52.6 | Angle of internal friction (°) | 54.9 | | | | Row distance (m) | 1.5 | | | | |
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