Research Article
Influence of Arch Foot Defect of Primary Support on Mechanical Behaviors of an Arch Frame in Underground Tunnels
Table 3
Primary support parameters of tunnel surrounding rock.
(a) Shotcrete parameters |
| | Young’s modulus, (MPa) | Poisson’s ratio, | Bulk modulus, (GPa) | Shear modulus, (GPa) | Cohesion, (MPa) | Internal friction angle, (°) | Density,
(kg/m3) |
| | 2000 | 0.34 | 16 | 9.6 | 2 | 60 | 2500 |
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(b) Parameters of bolt and grouting body |
| | Simulated object | Young’s modulus, (MPa) | Cross sectional area, (cm2) | Density,
(kg/m3) | Tensile strength, (MPa) |
| | Bolt | 200 | 2.54 | 7850 | 0.24 | | Simulated object | Cohesion, (MPa) | Internal friction angle, (°) | Shear stiffness
(MPa/mm) | Outer ring perimeter | | Grout | 2 | 30 | 20 | 0.0942 |
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(c) Grid arch parameters |
| | Simulated object | Young’s modulus, (MPa) | Cross sectional area, (cm2) | Density, (kg/m3) | Poisson’s ratio, |
| | Grid arch | 200 | 19.63 | 7850 | 0.25 | | Defective arch | 2.2 | 19.63 | 20 | 0.39 |
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