Research Article
A Case Study of Optimization and Application of Soft-Rock Roadway Support in Xiaokang Coal Mine, China
Table 1
Main parameters of the U-shaped steel support.
| | Type | Material | Elastic modulus E1 (GPa) | Poisson ratio μ | Tangent modulus E2 (GPa) | Yield strength σs (MPa) | Tensile strength σb (MPa) |
| | 25U | 25MnK | 206 | 0.3 | 21 | 335 | 530 | | 29U | 25MnK | 206 | 0.3 | 21 | 335 | 530 | | 36U | 20MnK | 210 | 0.3 | 19 | 350 | 530 | | 40U | 20MnVK | 215 | 0.3 | 20 | 390 | 580 |
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