Research Article
Study on the Influence of Cracks on the Mechanical Performance of Tunnel Lining Structure Based on Fracture Mechanics Theory
Table 4
Physical and mechanical parameters of surrounding rock and support.
| | Material | Elastic modulus E (MPa) | Poisson’s ratio | Bulk density (kN/m3) | Cohesion (MPa) | Internal friction angle (°) | Dilatancy angle (°) |
| | Surrounding rock (class IV) | 2630 | 0.35 | 23 | 0.45 | 30 | 30 | | Shotcrete | 21000 | 0.2 | 25 | 2 | 60 | 60 | | Secondary lining concrete | 31000 | 0.2 | 25 | 3 | 60 | 60 | | Bolt | 200000 | 0.3 | 78 | — | — | — |
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