Research Article
Instability Process of Crack Propagation and Tunnel Failure Affected by Cross-Sectional Geometry of an Underground Tunnel
Table 2
The principle of determining physical model parameters.
| | Parameters | Compressive strength, Rc (MPa) | Tensile strength, Rt (MPa) | Cohesion, C (MPa) | Internal friction angle, φ (°) | Modulus of elasticity, E (GPa) | Poisson’s ratio, μ | Density, ρ (kg/m3) |
| | Prototype | 40 | 2.7 | 2.0 | 50 | 20 | 0.25 | 2400 | | Similarity ratios | 0.0528 | 0.0528 | 0.0528 | 1 | 0.0528 | 1 | 0.792 | | Theoretical parameters of the model | 2.0 | 0.14 | 0.1 | 50 | 1.0 | 0.25 | 1800 | | Actual parameters of the model | 2.28 | 0.3 | 0.8 | 54 | 0.63 | 0.25 | 1800 |
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