Research Article
Failure Mechanism Analysis and Support Design for Deep Composite Soft Rock Roadway: A Case Study of the Yangcheng Coal Mine in China
Table 2
Physical and mechanical parameters of surrounding rocks.
| Serial number | Lithology | Natural specimens | Saturated specimens | Bulk density (KN·m3) | Uniaxial compressive strength (MPa) | Tensile strength (MPa) | Poisson’s ratio | Elastic modulus (GPa) | Uniaxial compressive strength (MPa) | Softening coefficient |
| ① | Siltstone | 25.70 | 47.46 | 5.82 | 0.25 | 5.89 | 22.78 | 0.48 | ② | Fine sandstone | 25.16 | 31.85 | 3.76 | 0.13 | 5.23 | 17.20 | 0.54 | ③ | Medium-grained sandstone | 24.61 | 30.14 | 4.49 | 0.18 | 5.23 | 22.00 | 0.73 | ④ | Mudstone | 24.65 | 24.13 | 1.63 | 0.11 | 3.10 | — | — | ⑤ | Mudstone | 25.75 | 23.05 | 2.22 | 0.10 | 4.30 | 6.45 | 0.28 |
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