Research Article
A Case Study of Tunnel Reinforcement Measure during Traffic Upgrading in Chongqing City, China
Table 2
Physical and mechanical parameters of the tunnel and supporting elements.
| | Item | Elastic modulus, E (MPa) | Poisson’s ratio, (μ) | Density, γ (kg/m3) |
| | C15 concretes (original lining) | 26,000 | 0.20 | 2,300 | | C25 sprayed concretes | 23,000 | 0.20 | 2,200 | | I22b steel arch frames, [20 U-steel and D306 steel tubes (Q235)] | 206,000 | 0.28 | 7,850 |
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